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-rw-r--r--src/data.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/data.c b/src/data.c
index 4ef81f2474e..33dd619a0e1 100644
--- a/src/data.c
+++ b/src/data.c
@@ -2982,7 +2982,7 @@ bool_vector_spare_mask (EMACS_INT nr_bits)
/* Info about unsigned long long, falling back on unsigned long
if unsigned long long is not available. */
-#if HAVE_UNSIGNED_LONG_LONG_INT
+#if HAVE_UNSIGNED_LONG_LONG_INT && defined ULLONG_MAX
enum { BITS_PER_ULL = CHAR_BIT * sizeof (unsigned long long) };
# define ULL_MAX ULLONG_MAX
#else