diff --git a/configure.ac b/configure.ac
index 89cc75f5b4e..7e875c857e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -375,6 +375,7 @@ AC_CHECK_TYPES(ptrdiff_t)
 # Check for type sizes
 #
 
+AC_CHECK_SIZEOF(_Bool)
 AC_CHECK_SIZEOF(char)
 AC_CHECK_SIZEOF(short)
 AC_CHECK_SIZEOF(int)