diff --git a/MagickCore/configure.c b/MagickCore/configure.c
index 6049bb0..4fa904e 100644
--- a/MagickCore/configure.c
+++ b/MagickCore/configure.c
@@ -51,6 +51,7 @@
 #include "MagickCore/memory_.h"
 #include "MagickCore/semaphore.h"
 #include "MagickCore/string_.h"
+#include "MagickCore/string-private.h"
 #include "MagickCore/token.h"
 #include "MagickCore/utility.h"
 #include "MagickCore/utility-private.h"