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-rw-r--r--test/ubsan/TestCases/Misc/deduplication.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ubsan/TestCases/Misc/deduplication.cpp b/test/ubsan/TestCases/Misc/deduplication.cpp
index 7d7b0bd58c6ed..4b02590fa0ac2 100644
--- a/test/ubsan/TestCases/Misc/deduplication.cpp
+++ b/test/ubsan/TestCases/Misc/deduplication.cpp
@@ -11,6 +11,7 @@ void overflow() {
int main() {
// CHECK: Start
fprintf(stderr, "Start\n");
+ fflush(stderr);
// CHECK: runtime error
// CHECK-NOT: runtime error