diff --git a/jni/Application.mk b/jni/Application.mk
index 7871da76..e746e2b4 100644
--- a/jni/Application.mk
+++ b/jni/Application.mk
@@ -13,7 +13,7 @@ endif
 
 
 CFLAGS_OPT :=  -O3 -fomit-frame-pointer -ggdb -funsafe-math-optimizations -ftree-vectorize -fgraphite-identity -floop-interchange -funsafe-loop-optimizations -finline-limit=1024
-CFLAGS_OPT_ARM := -marm -mfpu=neon -mcpu=cortex-a9 -pipe -mvectorize-with-neon-quad -DVECTORIZE_SINCOS -fPIC
+CFLAGS_OPT_ARM := -mthumb -mfpu=neon -mcpu=cortex-a9 -pipe -mvectorize-with-neon-quad -DVECTORIZE_SINCOS -fPIC
 CFLAGS_OPT_ARMv5 :=-march=armv6 -mfpu=vfp -marm -pipe
 CFLAGS_OPT_X86 := -mtune=atom -march=atom -mssse3 -mfpmath=sse -funroll-loops -pipe -DVECTORIZE_SINCOS
 CFLAGS_HARDFP := -D_NDK_MATH_NO_SOFTFP=1 -mhard-float -mfloat-abi=hard -DLOAD_HARDFP -DSOFTFP_LINK