diff --git a/src/cpu/386_dynarec.c b/src/cpu/386_dynarec.c
index a030ac915..15c33100d 100644
--- a/src/cpu/386_dynarec.c
+++ b/src/cpu/386_dynarec.c
@@ -196,6 +196,9 @@ static void prefetch_run(int instr_cycles, int bytes, int modrm, int reads, int
 {
 	int mem_cycles = reads*cpu_cycles_read + reads_l*cpu_cycles_read_l + writes*cpu_cycles_write + writes_l*cpu_cycles_write_l;
 
+	if (is486)
+		return;
+
 	if (instr_cycles < mem_cycles)
 		instr_cycles = mem_cycles;