diff --git a/src/bus.c b/src/bus.c
index dec03dd..a0dfcde 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -10,6 +10,7 @@
 
 #include <sys/types.h>
 
+#include <gc/gc.h>
 #include <utlist.h>
 
 #include "bus.h"
@@ -26,7 +27,7 @@ bus_device_add(bus_t *b, device_t *d, uint16_t addr)
 {
 	device_mapping_t *dm;
 
-	dm = (device_mapping_t *) malloc(sizeof(device_mapping_t));
+	dm = (device_mapping_t *) GC_MALLOC(sizeof(device_mapping_t));
 
 	dm->dev = d;
 	/* TODO: check if addr + size is not bigger than RK65C02_BUS_SIZE */
@@ -186,7 +187,5 @@ void
 bus_finish(bus_t *t)
 {
 	assert(t != NULL);
-
-	/* TODO: foreach devices free 'em */
 }
 
diff --git a/src/debug.c b/src/debug.c
index 81371c3..5225b64 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -1,5 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
+
+#include <gc/gc.h>
 #include <utlist.h>
 
 #include "rk65c02.h"
@@ -33,9 +35,6 @@ debug_trace_print_all(rk65c02emu_t *e)
 
 		rk65c02_log(LOG_TRACE, "%X: %s\t%s", tr->address, instrstr,
 		    regsstr);
-
-		free(instrstr);
-		free(regsstr);
 	}
 
 }
@@ -46,7 +45,7 @@ debug_trace_savestate(rk65c02emu_t *e, uint16_t address, instrdef_t *id,
 {
 	trace_t *tr;
 
-	tr = (trace_t *) malloc(sizeof(trace_t));
+	tr = (trace_t *) GC_MALLOC(sizeof(trace_t));
 	if (tr == NULL) {
 		fprintf(stderr, "Error allocating trace structure.\n");
 		return;
@@ -86,7 +85,7 @@ debug_breakpoint_add(rk65c02emu_t *e, uint16_t address)
 {
 	breakpoint_t *bp;
 
-	bp = (breakpoint_t *) malloc(sizeof(breakpoint_t));
+	bp = (breakpoint_t *) GC_MALLOC(sizeof(breakpoint_t));
 	if (bp == NULL)
 		return false;
 
diff --git a/src/device_fb.c b/src/device_fb.c
index 3cbcf24..d112925 100644
--- a/src/device_fb.c
+++ b/src/device_fb.c
@@ -3,6 +3,8 @@
 #include <assert.h>
 #include <string.h>
 
+#include <gc/gc.h>
+
 #include "bus.h"
 #include "device.h"
 
@@ -55,7 +57,7 @@ device_fb_init()
 	device_t *d;
 	struct fb_state *f;
 
-	d = (device_t *) malloc(sizeof(device_t));
+	d = (device_t *) GC_MALLOC(sizeof(device_t));
 
 	assert(d != NULL);
 
@@ -65,10 +67,10 @@ device_fb_init()
 	d->read_1 = device_fb_read_1;
 	d->write_1 = device_fb_write_1;
 
-	f = malloc(sizeof(struct fb_state));
+	f = GC_MALLOC(sizeof(struct fb_state));
 	d->aux = f;
 
-	f->cram = malloc(FB_AS_SIZE);
+	f->cram = GC_MALLOC(FB_AS_SIZE);
 	memset(d->aux, 0, FB_AS_SIZE);
 
 	return d;
@@ -81,7 +83,5 @@ device_fb_finish(device_t *d)
 
 	f = d->aux;
 
-	free(f->cram);
-	free(f);
 }
 
diff --git a/src/device_ram.c b/src/device_ram.c
index 9bcbaa2..8c07133 100644
--- a/src/device_ram.c
+++ b/src/device_ram.c
@@ -3,6 +3,8 @@
 #include <assert.h>
 #include <string.h>
 
+#include <gc/gc.h>
+
 #include "bus.h"
 #include "device.h"
 
@@ -38,7 +40,7 @@ device_ram_init(uint16_t size)
 {
 	device_t *d;
 
-	d = (device_t *) malloc(sizeof(device_t));
+	d = (device_t *) GC_MALLOC(sizeof(device_t));
 
 	assert(d != NULL);
 
@@ -48,7 +50,7 @@ device_ram_init(uint16_t size)
 	d->read_1 = device_ram_read_1;
 	d->write_1 = device_ram_write_1;
 
-	d->aux = malloc(size);
+	d->aux = GC_MALLOC(size);
 	memset(d->aux, 0, size);
 
 	return d;
@@ -57,6 +59,5 @@ device_ram_init(uint16_t size)
 void
 device_ram_finish(device_t *d)
 {
-	free(d->aux);
 }
 
diff --git a/src/device_serial.c b/src/device_serial.c
index c75c1a1..7ff652c 100644
--- a/src/device_serial.c
+++ b/src/device_serial.c
@@ -7,6 +7,8 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+#include <gc/gc.h>
+
 #include "bus.h"
 #include "device.h"
 
@@ -74,7 +76,7 @@ device_serial_init()
 	device_t *d;
 	struct device_serial_priv *dp;
 
-	d = (device_t *) malloc(sizeof(device_t));
+	d = (device_t *) GC_MALLOC(sizeof(device_t));
 
 	assert(d != NULL);
 
@@ -84,7 +86,7 @@ device_serial_init()
 	d->read_1 = device_serial_read_1;
 	d->write_1 = device_serial_write_1;
 
-	dp = (struct device_serial_priv *) malloc(sizeof(struct device_serial_priv));
+	dp = (struct device_serial_priv *) GC_MALLOC(sizeof(struct device_serial_priv));
 	d->aux = dp; 
 		
 	if (mkfifo(txpipepath, S_IRUSR | S_IWUSR) != 0) {
@@ -115,8 +117,6 @@ device_serial_finish(device_t *d)
 	unlink(txpipepath);
 	unlink(rxpipepath);
 
-	free(d->aux);
-
 	// XXX?
 }
 
diff --git a/src/instruction.c b/src/instruction.c
index 5dab91f..8554062 100644
--- a/src/instruction.c
+++ b/src/instruction.c
@@ -7,6 +7,8 @@
 #include <assert.h>
 #include <string.h>
 
+#include <gc/gc.h>
+
 #include "bus.h"
 #include "rk65c02.h"
 #include "65c02isa.h"
@@ -61,8 +63,6 @@ instruction_print(instruction_t *i)
 	str = instruction_string_get(i);
 
 	printf("%s", str);
-
-	free(str);
 }
 
 char *
@@ -72,7 +72,7 @@ instruction_string_get(instruction_t *i)
 	instrdef_t id;
 	char *str;
 
-	str = malloc(INSTR_STR_LEN);
+	str = GC_MALLOC(INSTR_STR_LEN);
 	if (str == NULL) {
 		rk65c02_log(LOG_CRIT, "Error allocating memory for buffer: %s.",
 		    strerror(errno));
@@ -164,7 +164,6 @@ assemble_single(assembler_t *a, const char *mnemonic, addressing_t mode, uint8_t
 		return rv;
 
 	rv = bus_load_buf(a->bus, a->pc, asmbuf, bsize);
-	free(asmbuf);
 	a->pc += bsize;
 
 	return rv;
@@ -205,7 +204,7 @@ assemble_single_buf(uint8_t **buf, uint8_t *bsize, const char *mnemonic, address
 	}
 
 	*bsize = id.size;
-	*buf = malloc(id.size);
+	*buf = GC_MALLOC(id.size);
 	if(*buf == NULL) {
 		rk65c02_log(LOG_ERROR, "Error allocating assembly buffer.");
 		return false;
diff --git a/src/rk65c02.c b/src/rk65c02.c
index 7e2a96d..cc4e406 100644
--- a/src/rk65c02.c
+++ b/src/rk65c02.c
@@ -7,6 +7,8 @@
 #include <assert.h>
 #include <string.h>
 
+#include <gc/gc.h>
+
 #include "bus.h"
 #include "instruction.h"
 #include "rk65c02.h"
@@ -195,7 +197,6 @@ rk65c02_dump_regs(reg_state_t regs)
 
 	printf ("%s\n", str);
 
-	free(str);
 }
 
 char *
@@ -205,7 +206,7 @@ rk65c02_regs_string_get(reg_state_t regs)
 	char *str;
 
 	/* XXX: string allocation to a separate utility function? */
-	str = malloc(REGS_STR_LEN);
+	str = GC_MALLOC(REGS_STR_LEN);
 	if (str == NULL) {
 		rk65c02_log(LOG_CRIT, "Error allocating memory for buffer: %s.",
 		    strerror(errno));
diff --git a/test/Makefile b/test/Makefile
index 80845f3..1c669c7 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,5 +1,5 @@
 CFLAGS=-Wall -I../src -g
-LDFLAGS=-latf-c 
+LDFLAGS=-latf-c -lgc
 RK6502LIB=../src/librk65c02.a
 VASM=vasm6502_std
 VASMFLAGS=-Fbin -c02
diff --git a/test/test_assemble.c b/test/test_assemble.c
index 40c8bcc..0f18e04 100644
--- a/test/test_assemble.c
+++ b/test/test_assemble.c
@@ -28,20 +28,17 @@ ATF_TC_BODY(assemble_single_buf, tc)
 	ATF_REQUIRE(assemble_single_buf_implied(&asmbuf, &bsize, "nop"));
 	ATF_CHECK(asmbuf[0] == 0xEA);	/* check if nop really */
 	ATF_REQUIRE(bus_load_buf(&b, caddr, asmbuf, bsize));
-	free(asmbuf);
 	caddr += bsize;
 
 	ATF_REQUIRE(assemble_single_buf(&asmbuf, &bsize, "lda", IMMEDIATE, 0xAA, 0));
 	ATF_CHECK(asmbuf[0] == 0xA9);	/* check if lda really */
 	ATF_CHECK(asmbuf[1] == 0xAA);	/* check the operand */
 	ATF_REQUIRE(bus_load_buf(&b, caddr, asmbuf, bsize));
-	free(asmbuf);
 	caddr += bsize;
 
 	ATF_REQUIRE(assemble_single_buf_implied(&asmbuf, &bsize, "stp"));
 	ATF_CHECK(asmbuf[0] == 0xDB);	/* check if stp really */
 	ATF_REQUIRE(bus_load_buf(&b, caddr, asmbuf, bsize));
-	free(asmbuf);
 	caddr += bsize;
 
 	rk65c02_start(&e);
diff --git a/test/test_interrupt.c b/test/test_interrupt.c
index a895a62..464a833 100644
--- a/test/test_interrupt.c
+++ b/test/test_interrupt.c
@@ -87,17 +87,14 @@ ATF_TC_BODY(intr_rti, tc)
 
 	ATF_REQUIRE(assemble_single_buf_implied(&asmbuf, &bsize, "nop"));
 	ATF_REQUIRE(bus_load_buf(&b, israsmpc, asmbuf, bsize));
-	free(asmbuf);
 	israsmpc += bsize;
 
 	ATF_REQUIRE(assemble_single_buf_implied(&asmbuf, &bsize, "rti"));
 	ATF_REQUIRE(bus_load_buf(&b, israsmpc, asmbuf, bsize));
-	free(asmbuf);
 	israsmpc += bsize;
 
 	ATF_REQUIRE(assemble_single_buf_implied(&asmbuf, &bsize, "nop"));
 	ATF_REQUIRE(bus_load_buf(&b, ROM_LOAD_ADDR, asmbuf, bsize));
-	free(asmbuf);
 
 	/* There's a return address and saved processor flags on stack. */
 	e.regs.SP = 0xFF;
diff --git a/test/utils.c b/test/utils.c
index ff7bc34..7eaf446 100644
--- a/test/utils.c
+++ b/test/utils.c
@@ -2,7 +2,9 @@
 #include <stdlib.h>
 #include <limits.h>
 #include <string.h>
+
 #include <atf-c.h>
+#include <gc/gc.h>
 
 #include "bus.h"
 #include "rk65c02.h"
@@ -15,7 +17,7 @@ rom_path(const char *name, const atf_tc_t *tc)
 	char *rompath;
 	const char *srcdir;
 
-	rompath = malloc(PATH_MAX);
+	rompath = GC_MALLOC(PATH_MAX);
 	srcdir = atf_tc_get_config_var(tc, "srcdir");
 
 	strcpy(rompath, srcdir);