diff --git a/tests/Regression/bz827362-RHEL6-2-ftell-after-fseek-moves-the-offset-on-a/test.c b/tests/Regression/bz827362-RHEL6-2-ftell-after-fseek-moves-the-offset-on-a/test.c
index 496fe4c..b8636bb 100644
--- a/tests/Regression/bz827362-RHEL6-2-ftell-after-fseek-moves-the-offset-on-a/test.c
+++ b/tests/Regression/bz827362-RHEL6-2-ftell-after-fseek-moves-the-offset-on-a/test.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <locale.h>
+#include <wchar.h>
 
 int main(int argc, char** argv)
 {