diff --git a/src/cc65/preproc.c b/src/cc65/preproc.c
index 92042c041..8a35d0f27 100644
--- a/src/cc65/preproc.c
+++ b/src/cc65/preproc.c
@@ -316,7 +316,6 @@ static void ExpandMacroArgs (Macro* M)
                     switch (*Replacement) {
                         case '\"':
                         case '\\':
-                        case '\'':
                             keepch ('\\');
                         /* FALLTHROUGH */
                         default: