diff --git a/java/libraries/io/src/native/Makefile b/java/libraries/io/src/native/Makefile
index c35acf87e..6a2c00373 100644
--- a/java/libraries/io/src/native/Makefile
+++ b/java/libraries/io/src/native/Makefile
@@ -3,7 +3,7 @@ OBJS := impl.o
 CC := gcc
 
 # prefix with -m32 to compile for linux32
-CFLAGS := -std=gnu99 -fPIC -g
+CFLAGS := -std=gnu99 -fPIC -g -ffast-math
 CFLAGS += -I$(shell dirname $(shell realpath $(shell which javac)))/../include
 CFLAGS += -I$(shell dirname $(shell realpath $(shell which javac)))/../include/linux
 LDFLAGS := -shared