diff --git a/vm/pc/dump.c b/vm/pc/dump.c
index 334274b..0096f3e 100644
--- a/vm/pc/dump.c
+++ b/vm/pc/dump.c
@@ -36,15 +36,19 @@ void dump_instr(ctx_t *ctx,
 #if _ATT_STYLE == 0
     log("%s", in->name);
 #else
-    char s1[2] = {0, 0}, s2[2] = {0, 0};
+    char s0[2] = {0,0}, s1[2] = {0, 0}, s2[2] = {0, 0};
 
-    if (p1 && ACC_IS_MEM(p1))
+    if (p1 && ACC_IS_MEM(p1)) {
+        s0[0] = ':';
         s1[0] = getmempref(p1->mlen);
+    }
 
-    if (p2 && ACC_IS_MEM(p2))
+    if (p2 && ACC_IS_MEM(p2)) {
+        s0[0] = ':';
         s2[0] = getmempref(p2->mlen);
+    }
 
-    log("%s%s%s", in->name, s1, s2);
+    log("%s%s%s%s", in->name, s0, s1, s2);
 #endif
 
     if (rep)