diff --git a/Makefile b/Makefile
index 63e15e65..939a2cdf 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,7 @@ CPP=g++
 NVCC=nvcc 
 AR=ar
 ARFLAGS=rcs
-OPTS=-Ofast
+OPTS=-Ofast -fno-unsafe-math-optimizations
 LDFLAGS= -lm -pthread 
 COMMON= -Iinclude/ -Isrc/
 CFLAGS=-Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC