diff --git a/src/add-ons/print/drivers/pdf/source/RegExp.cpp b/src/add-ons/print/drivers/pdf/source/RegExp.cpp
index f03fcc8c38..1a270e6ca7 100644
--- a/src/add-ons/print/drivers/pdf/source/RegExp.cpp
+++ b/src/add-ons/print/drivers/pdf/source/RegExp.cpp
@@ -1254,7 +1254,7 @@ RegExp::Dump()
 char *
 RegExp::Prop(const char *op) const
 {
-	char *p = NULL;
+	const char *p = NULL;
 	static char buf[50];
 
 	(void) strcpy(buf, ":");