diff --git a/libc/test/integration/startup/gpu/rpc_stream_test.cpp b/libc/test/integration/startup/gpu/rpc_stream_test.cpp
index 877ded34b1aaa..3d495b4df9940 100644
--- a/libc/test/integration/startup/gpu/rpc_stream_test.cpp
+++ b/libc/test/integration/startup/gpu/rpc_stream_test.cpp
@@ -15,6 +15,7 @@
 #include "test/IntegrationTest/test.h"
 
 extern "C" void *malloc(uint64_t);
+extern "C" void free(void *);
 
 using namespace __llvm_libc;