diff --git a/src/65c02isa.csv b/src/65c02isa.csv
index 93fa44a..6bca62f 100644
--- a/src/65c02isa.csv
+++ b/src/65c02isa.csv
@@ -183,7 +183,7 @@ OP_LDY_ZPX,"ldy",ZPX,2,emul_ldy,false
 OP_LDA_ZPX,"lda",ZPX,2,emul_lda,false
 OP_LDX_ZPY,"ldx",ZPY,1,emul_ldx,false
 OP_SMB3_ZP,"smb3",ZP,2,NULL,false
-OP_CLV,"clv",IMPLIED,1,NULL,false
+OP_CLV,"clv",IMPLIED,1,emul_clv,false
 OP_LDA_ABSY,"lda",ABSOLUTEY,3,emul_lda,false
 OP_TSX,"tsx",IMPLIED,1,emul_tsx,false
 OP_NOPI_BC,"nop",IMPLIED,1,NULL,false
diff --git a/src/emulation.c b/src/emulation.c
index 3eb4253..e0bb186 100644
--- a/src/emulation.c
+++ b/src/emulation.c
@@ -72,6 +72,13 @@ emul_clc(rk65c02emu_t *e, void *id, instruction_t *i)
 	e->regs.P &= ~P_CARRY;
 }
 
+/* CLV - clear overflow flag */
+void
+emul_clv(rk65c02emu_t *e, void *id, instruction_t *i)
+{
+	e->regs.P &= ~P_SIGN_OVERFLOW;
+}
+
 /* DEC  - decrement memory location/acumulator */
 void
 emul_dec(rk65c02emu_t *e, void *id, instruction_t *i)
diff --git a/test/test_emulation.c b/test/test_emulation.c
index c1d4f48..202eeda 100644
--- a/test/test_emulation.c
+++ b/test/test_emulation.c
@@ -287,6 +287,23 @@ ATF_TC_BODY(emul_stz, tc)
 	bus_finish(&b);
 }
 
+ATF_TC_WITHOUT_HEAD(emul_clv);
+ATF_TC_BODY(emul_clv, tc)
+{
+	rk65c02emu_t e;
+	bus_t b;
+
+	b = bus_init();
+	e = rk65c02_init(&b);
+
+	e.regs.P |= P_SIGN_OVERFLOW;
+	/* CLV */
+	ATF_REQUIRE(rom_start(&e, "test_emulation_clv.rom", tc));
+	ATF_CHECK(e.regs.P ^ P_SIGN_OVERFLOW);
+
+	bus_finish(&b);
+}
+
 ATF_TC_WITHOUT_HEAD(emul_clc_sec);
 ATF_TC_BODY(emul_clc_sec, tc)
 {
@@ -665,6 +682,7 @@ ATF_TP_ADD_TCS(tp)
 	ATF_TP_ADD_TC(tp, emul_dec);
 	ATF_TP_ADD_TC(tp, emul_dex_dey);
 	ATF_TP_ADD_TC(tp, emul_clc_sec);
+	ATF_TP_ADD_TC(tp, emul_clv);
 	ATF_TP_ADD_TC(tp, emul_inc);
 	ATF_TP_ADD_TC(tp, emul_inx_iny);
 	ATF_TP_ADD_TC(tp, emul_jmp);
diff --git a/test/test_emulation_clv.s b/test/test_emulation_clv.s
new file mode 100644
index 0000000..f0c298a
--- /dev/null
+++ b/test/test_emulation_clv.s
@@ -0,0 +1,3 @@
+start:  clv
+	stp
+