diff --git a/configure b/configure
index 19eaedfba3..9f8d17f539 100755
--- a/configure
+++ b/configure
@@ -2841,7 +2841,7 @@ else
     typedef signed char int_fast8_t;
     typedef signed int  int_fast16_t;
     typedef signed int  int_fast32_t;
-    typedef signed long long int  int_fast64_t;
+    typedef signed long long int_fast64_t;
     typedef unsigned char uint_fast8_t;
     typedef unsigned int  uint_fast16_t;
     typedef unsigned int  uint_fast32_t;