diff --git a/libsrc/geos/common/perror.c b/libsrc/geos/common/perror.c
index 6d64b25a2..4e24023ee 100644
--- a/libsrc/geos/common/perror.c
+++ b/libsrc/geos/common/perror.c
@@ -12,6 +12,6 @@
 void perror(const char* msg)
 {
 
-    DlgBoxOk((char*)msg,strerror(errno));
+    DlgBoxOk(msg,strerror(errno));
 
 }