diff --git a/src/instruction.c b/src/instruction.c
index c3ba5f7..68ad7e4 100644
--- a/src/instruction.c
+++ b/src/instruction.c
@@ -119,6 +119,12 @@ assemble_init(bus_t *b, uint16_t pc)
 	return asmblr;
 }
 
+bool
+assemble_single_implied(assembler_t *a, const char *mnemonic)
+{
+	return assemble_single(a, mnemonic, IMPLIED, 0, 0);
+}
+
 bool
 assemble_single(assembler_t *a, const char *mnemonic, addressing_t mode, uint8_t op1, uint8_t op2)
 {
diff --git a/src/instruction.h b/src/instruction.h
index e5d1c5c..0fd11df 100644
--- a/src/instruction.h
+++ b/src/instruction.h
@@ -67,6 +67,6 @@ bool assemble_single_buf(uint8_t **, uint8_t *, const char *, addressing_t, uint
 
 assembler_t assemble_init(bus_t *, uint16_t);
 bool assemble_single(assembler_t *, const char *, addressing_t, uint8_t, uint8_t);
-bool assemble_single_implied(uint8_t **, uint8_t *, const char *);
+bool assemble_single_implied(assembler_t *, const char *);
 
 #endif /* _INSTRUCTION_H_ */