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-rw-r--r--linux-user/strace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/linux-user/strace.c b/linux-user/strace.c
index 1233ebceb0..758c5d32b6 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -54,7 +54,7 @@ struct flags {
 };
 
 /* No 'struct flags' element should have a zero mask. */
-#define FLAG_BASIC(V, M, N)      { V, M | QEMU_BUILD_BUG_ON_ZERO(!(M)), N }
+#define FLAG_BASIC(V, M, N)      { V, M | QEMU_BUILD_BUG_ON_ZERO((M) == 0), N }
 
 /* common flags for all architectures */
 #define FLAG_GENERIC_MASK(V, M)  FLAG_BASIC(V, M, #V)