diff --git a/src/arm/isa-arm.c b/src/arm/isa-arm.c
index dfbd3852a..5a9d85b7d 100644
--- a/src/arm/isa-arm.c
+++ b/src/arm/isa-arm.c
@@ -416,6 +416,7 @@ void ARMStep(struct ARMCore* cpu) {
 		int rs = (opcode >> 8) & 0xF; \
 		int rm = opcode & 0xF; \
 		UNUSED(rdHi); \
+		ARM_WAIT_MUL(cpu->gprs[rs]); \
 		BODY; \
 		S_BODY; \
 		if (rd == ARM_PC) { \
diff --git a/src/arm/isa-inlines.h b/src/arm/isa-inlines.h
index c2167a5cc..0e837712f 100644
--- a/src/arm/isa-inlines.h
+++ b/src/arm/isa-inlines.h
@@ -52,6 +52,17 @@
 #define ARM_V_ADDITION(M, N, D) (!(ARM_SIGN((M) ^ (N))) && (ARM_SIGN((M) ^ (D))) && (ARM_SIGN((N) ^ (D))))
 #define ARM_V_SUBTRACTION(M, N, D) ((ARM_SIGN((M) ^ (N))) && (ARM_SIGN((M) ^ (D))))
 
+#define ARM_WAIT_MUL(R) \
+	if ((R & 0xFFFFFF00) == 0xFFFFFF00 || !(R & 0xFFFFFF00)) { \
+		cpu->cycles += 1; \
+	} else if ((R & 0xFFFF0000) == 0xFFFF0000 || !(R & 0xFFFF0000)) { \
+		cpu->cycles += 2; \
+	} else if ((R & 0xFF000000) == 0xFF000000 || !(R & 0xFF000000)) { \
+		cpu->cycles += 3; \
+	} else { \
+		cpu->cycles += 4; \
+	}
+
 #define ARM_STUB cpu->board->hitStub(cpu->board, opcode)
 
 #define ARM_WRITE_PC \
diff --git a/src/arm/isa-thumb.c b/src/arm/isa-thumb.c
index 2f5a8ecc1..5f8b4cf8a 100644
--- a/src/arm/isa-thumb.c
+++ b/src/arm/isa-thumb.c
@@ -275,7 +275,7 @@ DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(NEG, THUMB_SUBTRACTION(cpu->gprs[rd], 0, cp
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(CMP2, int32_t aluOut = cpu->gprs[rd] - cpu->gprs[rn]; THUMB_SUBTRACTION_S(cpu->gprs[rd], cpu->gprs[rn], aluOut))
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(CMN, int32_t aluOut = cpu->gprs[rd] + cpu->gprs[rn]; THUMB_ADDITION_S(cpu->gprs[rd], cpu->gprs[rn], aluOut))
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(ORR, cpu->gprs[rd] = cpu->gprs[rd] | cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))
-DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(MUL, cpu->gprs[rd] *= cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))
+DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(MUL, ARM_WAIT_MUL(cpu->gprs[rn]); cpu->gprs[rd] *= cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(BIC, cpu->gprs[rd] = cpu->gprs[rd] & ~cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(MVN, cpu->gprs[rd] = ~cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))