diff --git a/Cantera/src/stringUtils.cpp b/Cantera/src/stringUtils.cpp
index 51d345e2e..1657dfbab 100755
--- a/Cantera/src/stringUtils.cpp
+++ b/Cantera/src/stringUtils.cpp
@@ -14,7 +14,6 @@
 #include "ct_defs.h"
 #include "ctexceptions.h"
 #include <stdio.h>
-#include <ctype.h>
 #include <string.h>
 #include <stdlib.h>