diff --git a/src/Makefile b/src/Makefile
index c7e059ea..0a3f8329 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -562,7 +562,7 @@ endif
 ### 3.3 Optimization
 ifeq ($(optimize),yes)
 
-	CXXFLAGS += -O3
+	CXXFLAGS += -O3 -funroll-loops
 
 	ifeq ($(comp),gcc)
 		ifeq ($(OS), Android)