diff --git a/trunk/fcl/include/fcl/data_types.h b/trunk/fcl/include/fcl/data_types.h
index 287fea2825f4de865ef347e9f49e526dd9aed168..beebb70a8eb57961e3483ad8e8703e3cce7d4fd7 100644
--- a/trunk/fcl/include/fcl/data_types.h
+++ b/trunk/fcl/include/fcl/data_types.h
@@ -46,8 +46,8 @@ namespace fcl
 typedef double FCL_REAL;
 typedef uint64_t FCL_INT64;
 typedef int64_t FCL_UINT64;
-typedef unsigned int FCL_UINT32;
-typedef int FCL_INT32;
+typedef uint32_t FCL_UINT32;
+typedef int32_t FCL_INT32;
 
 /// @brief Triangle with 3 indices for points
 class Triangle