diff --git a/test/test_text_utils/test_text_utils.cpp b/test/test_text_utils/test_text_utils.cpp
index 097f70a..2fedff8 100644
--- a/test/test_text_utils/test_text_utils.cpp
+++ b/test/test_text_utils/test_text_utils.cpp
@@ -1,5 +1,6 @@
 
 #include <unity.h>
+#include <string.h>
 #include <TextUtilities.h>
 
 void testTcUtilIntegerConversions() {