diff --git a/src/libCom/test/epicsStdioTestMain.cpp b/src/libCom/test/epicsStdioTestMain.cpp
index d6431c1b7..0e816207a 100644
--- a/src/libCom/test/epicsStdioTestMain.cpp
+++ b/src/libCom/test/epicsStdioTestMain.cpp
@@ -18,7 +18,7 @@ int epicsStdioTest (const char *report);
 
 int main ( int argc, char *argv[] )
 {
-    char *report = "";
+    const char *report = "";
     if(argc>1) report = argv[1];
 
     epicsStdioTest (report);