diff --git a/setup.py b/setup.py
index 261338e..66188a5 100644
--- a/setup.py
+++ b/setup.py
@@ -94,7 +94,7 @@ if '--fast-compile' in sys.argv:
     sys.argv.remove('--fast-compile')
     oflag = ["-O0"]
 else:
-    oflag = ["-O3"]
+    oflag = ["-Os"]
 
 # Specific audio drivers source files to compile
 ad_files = []