diff --git a/src/unix/darwin.c b/src/unix/darwin.c
index d0ecd452d87..ce5e0e824ed 100644
--- a/src/unix/darwin.c
+++ b/src/unix/darwin.c
@@ -305,6 +305,11 @@ static int uv__get_cpu_speed(uint64_t* speed) {
 
   err = 0;
 out:
+  if(device_type_str != NULL)
+    pCFRelease(device_type_str);
+  if(clock_frequency_str != NULL)
+    pCFRelease(clock_frequency_str);
+
   if (core_foundation_handle != NULL)
     dlclose(core_foundation_handle);