diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c
index dac9909638ae1..7e3360061276b 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c
@@ -24,7 +24,7 @@
 
 #include "sanitizer_common/sanitizer_specific.h"
 
-static const size_t kBufferSize = 1 << 20;
+static const size_t kBufferSize = 8192;
 
 pthread_barrier_t bar;