--- eccodes-2.24.0-Source.unchanged/src/grib_api_internal.h	2021-12-07 12:03:44.000000000 +0100
+++ eccodes-2.24.0-Source/src/grib_api_internal.h	2021-12-09 10:02:54.686070864 +0100
@@ -40,9 +40,9 @@ extern "C" {
 
 #if IS_BIG_ENDIAN
 #if GRIB_MEM_ALIGN
-#define FAST_BIG_ENDIAN 0
-#else
 #define FAST_BIG_ENDIAN 1
+#else
+#define FAST_BIG_ENDIAN 0
 #endif
 #endif