diff --git a/libc/src/sys/random/linux/getrandom.cpp b/libc/src/sys/random/linux/getrandom.cpp
--- a/libc/src/sys/random/linux/getrandom.cpp
+++ b/libc/src/sys/random/linux/getrandom.cpp
@@ -23,7 +23,7 @@
     libc_errno = -ret;
     return -1;
   }
-  return 0;
+  return ret;
 }
 
 } // namespace __llvm_libc
diff --git a/libc/test/src/sys/random/linux/getrandom_test.cpp b/libc/test/src/sys/random/linux/getrandom_test.cpp
--- a/libc/test/src/sys/random/linux/getrandom_test.cpp
+++ b/libc/test/src/sys/random/linux/getrandom_test.cpp
@@ -29,6 +29,15 @@
   libc_errno = 0;
 }
 
+TEST(LlvmLibcGetRandomTest, ReturnsSize) {
+  static constexpr size_t SIZE = 8192;
+  uint8_t buf[SIZE];
+  for (size_t i = 0; i < SIZE; ++i) {
+    // Without GRND_RANDOM set this should never fail.
+    ASSERT_EQ(__llvm_libc::getrandom(buf, i, 0), static_cast<ssize_t>(i));
+  }
+}
+
 TEST(LlvmLibcGetRandomTest, PiEstimation) {
   static constexpr size_t LIMIT = 10000000;
   static constexpr double PI = 3.14159265358979;