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-rw-r--r--ext/bigdecimal/missing.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/bigdecimal/missing.h b/ext/bigdecimal/missing.h
index 11b58c099d..7969849158 100644
--- a/ext/bigdecimal/missing.h
+++ b/ext/bigdecimal/missing.h
@@ -45,7 +45,7 @@ extern "C" {
# if __has_builtin(__builtin_unreachable)
# define UNREACHABLE __builtin_unreachable()
-# elif HAVE___ASSUME
+# elif defined(HAVE___ASSUME)
# define UNREACHABLE __assume(0)
# else