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-rw-r--r--ruby_atomic.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ruby_atomic.h b/ruby_atomic.h
index 135a8c7e79..4a53e60824 100644
--- a/ruby_atomic.h
+++ b/ruby_atomic.h
@@ -64,7 +64,7 @@ rb_w32_atomic_or(volatile rb_atomic_t *var, rb_atomic_t val)
# define ATOMIC_SIZE_EXCHANGE(var, val) InterlockedExchange((LONG *)&(var), (val))
# endif
-#elif defined(__sun)
+#elif defined(__sun) && defined(HAVE_ATOMIC_H)
#include <atomic.h>
typedef unsigned int rb_atomic_t;