diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index 8e76b00070..65901a2b1d 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -649,6 +649,9 @@ ${SIZEOF_INT_CODE}
 /* The size of `long', as computed by sizeof. */
 ${SIZEOF_LONG_CODE}
 
+/* The size of `long long', as computed by sizeof. */
+${SIZEOF_LONG_LONG_CODE}
+
 /* The size of `off_t', as computed by sizeof. */
 ${SIZEOF_OFF_T_CODE}