diff --git a/src/cc65/coptstop.c b/src/cc65/coptstop.c
index f00410fa5..bc099a56c 100644
--- a/src/cc65/coptstop.c
+++ b/src/cc65/coptstop.c
@@ -1604,6 +1604,24 @@ static int HarmlessCall (const char* Name)
         "asrax3",
         "asrax4",
         "bnegax",
+        "decax1",
+        "decax2",
+        "decax3",
+        "decax4",
+        "decax5",
+        "decax6",
+        "decax7",
+        "decax8",
+        "decaxy",
+        "incax1",
+        "incax2",
+        "incax3",
+        "incax4",
+        "incax5",
+        "incax6",
+        "incax7",
+        "incax8",
+        "incaxy",
         "ldaxidx",
         "ldaxysp",
         "negax",