diff --git a/src/common/windows/string_utils.cc b/src/common/windows/string_utils.cc
index 1e570b525..956ee9906 100644
--- a/src/common/windows/string_utils.cc
+++ b/src/common/windows/string_utils.cc
@@ -30,6 +30,8 @@
 #include <config.h>  // Must come first
 #endif
 
+#include <stdlib.h>
+
 #include <cassert>
 #include <vector>