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-rw-r--r--erts/emulator/sys/common/erl_mseg.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index 5fff8e5ed7..84830d91ec 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -68,7 +68,7 @@
#define ALIGNED_CEILING(X) ALIGNED_FLOOR((X) + INV_ALIGNED_MASK)
#define MAP_IS_ALIGNED(X) (((UWord)(X) & (MSEG_ALIGNED_SIZE - 1)) == 0)
-#define IS_2POW(X) (((X) & ((X) - 1)) == 0)
+#define IS_2POW(X) ((X) && !((X) & ((X) - 1)))
static ERTS_INLINE Uint ceil_2pow(Uint x) {
int i = 1 << (4 + (sizeof(Uint) != 4 ? 1 : 0));
x--;