diff --git a/libc/test/src/string/memcmp_test.cpp b/libc/test/src/string/memcmp_test.cpp
--- a/libc/test/src/string/memcmp_test.cpp
+++ b/libc/test/src/string/memcmp_test.cpp
@@ -11,7 +11,7 @@
 
 TEST(LlvmLibcMemcmpTest, CmpZeroByte) {
   const char *lhs = "ab";
-  const char *rhs = "bc";
+  const char *rhs = "yz";
   EXPECT_EQ(__llvm_libc::memcmp(lhs, rhs, 0), 0);
 }
 
@@ -23,14 +23,14 @@
 
 TEST(LlvmLibcMemcmpTest, LhsBeforeRhsLexically) {
   const char *lhs = "ab";
-  const char *rhs = "ac";
-  EXPECT_EQ(__llvm_libc::memcmp(lhs, rhs, 2), -1);
+  const char *rhs = "az";
+  EXPECT_LT(__llvm_libc::memcmp(lhs, rhs, 2), 0);
 }
 
 TEST(LlvmLibcMemcmpTest, LhsAfterRhsLexically) {
-  const char *lhs = "ac";
+  const char *lhs = "az";
   const char *rhs = "ab";
-  EXPECT_EQ(__llvm_libc::memcmp(lhs, rhs, 2), 1);
+  EXPECT_GT(__llvm_libc::memcmp(lhs, rhs, 2), 0);
 }
 
 TEST(LlvmLibcMemcmpTest, Sweep) {
@@ -51,8 +51,8 @@
   reset(lhs);
   reset(rhs);
   for (size_t i = 0; i < kMaxSize; ++i) {
-    rhs[i] = 'b';
-    EXPECT_EQ(__llvm_libc::memcmp(lhs, rhs, kMaxSize), -1);
+    rhs[i] = 'z';
+    EXPECT_LT(__llvm_libc::memcmp(lhs, rhs, kMaxSize), 0);
     rhs[i] = 'a';
   }
 }