diff --git a/libsrc/common/strcat.s b/libsrc/common/strcat.s
index 74fef0759..7dce2f78a 100644
--- a/libsrc/common/strcat.s
+++ b/libsrc/common/strcat.s
@@ -8,6 +8,7 @@
         .export         _strcat
         .import         popax
         .importzp       ptr1, ptr2, tmp3
+        .macpack        cpu
 
 _strcat:
         sta ptr1        ; Save src
diff --git a/libsrc/common/strchr.s b/libsrc/common/strchr.s
index 48bb8822b..15c743776 100644
--- a/libsrc/common/strchr.s
+++ b/libsrc/common/strchr.s
@@ -8,6 +8,7 @@
         .export         _strchr
         .import         popax
         .importzp       ptr1, tmp1
+        .macpack        cpu
 
 _strchr:
         sta tmp1        ; Save c
diff --git a/libsrc/common/strncat.s b/libsrc/common/strncat.s
index 42717853f..e0fa39cc0 100644
--- a/libsrc/common/strncat.s
+++ b/libsrc/common/strncat.s
@@ -8,7 +8,8 @@
         .export         _strncat
         .import         popax
         .importzp       ptr1, ptr2, ptr3, tmp1, tmp2
-
+        .macpack        cpu
+        
 _strncat:
     eor #$FF        ; one's complement to count upwards
     sta tmp1