diff --git a/icu4c/source/test/intltest/intltest.cpp b/icu4c/source/test/intltest/intltest.cpp
index 3c2c23bf71d..964f87aae5d 100644
--- a/icu4c/source/test/intltest/intltest.cpp
+++ b/icu4c/source/test/intltest/intltest.cpp
@@ -16,6 +16,7 @@
 #include <string.h>
 #include <assert.h>
 #include <stdarg.h>
+#include <stdlib.h>
 
 #include "unicode/unistr.h"
 #include "unicode/ures.h"