diff --git a/llvm/lib/Fuzzer/test/OutOfMemorySingleLargeMallocTest.cpp b/llvm/lib/Fuzzer/test/OutOfMemorySingleLargeMallocTest.cpp
index ea23a601aa23..316b7682b8e6 100644
--- a/llvm/lib/Fuzzer/test/OutOfMemorySingleLargeMallocTest.cpp
+++ b/llvm/lib/Fuzzer/test/OutOfMemorySingleLargeMallocTest.cpp
@@ -15,7 +15,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   if (Size > 0 && Data[0] == 'H') {
     if (Size > 1 && Data[1] == 'i') {
       if (Size > 2 && Data[2] == '!') {
-          size_t kSize = 0xff000000U;
+          size_t kSize = 0x20000000U;
           char *p = new char[kSize];
           SinkPtr = p;
           delete [] p;
diff --git a/llvm/lib/Fuzzer/test/fuzzer-oom.test b/llvm/lib/Fuzzer/test/fuzzer-oom.test
index 8caf649e9f04..5c3bf78158a0 100644
--- a/llvm/lib/Fuzzer/test/fuzzer-oom.test
+++ b/llvm/lib/Fuzzer/test/fuzzer-oom.test
@@ -3,8 +3,8 @@ CHECK: ERROR: libFuzzer: out-of-memory (used: {{.*}}; limit: 300Mb)
 CHECK: Test unit written to ./oom-
 SUMMARY: libFuzzer: out-of-memory
 
-RUN: not LLVMFuzzer-OutOfMemorySingleLargeMallocTest 2>&1 | FileCheck %s --check-prefix=SINGLE_LARGE_MALLOC
-SINGLE_LARGE_MALLOC: libFuzzer: out-of-memory (malloc(42{{.*}}))
+RUN: not LLVMFuzzer-OutOfMemorySingleLargeMallocTest -rss_limit_mb=300 2>&1 | FileCheck %s --check-prefix=SINGLE_LARGE_MALLOC
+SINGLE_LARGE_MALLOC: libFuzzer: out-of-memory (malloc(53{{.*}}))
 SINGLE_LARGE_MALLOC: in LLVMFuzzerTestOneInput
 
 # Check that -rss_limit_mb=0 means no limit.