diff --git a/recipes-misc/recipes-multimedia/zynaddsubfx/zynaddsubfx_3.0.1.bb b/recipes-misc/recipes-multimedia/zynaddsubfx/zynaddsubfx_3.0.1.bb
index 9baf3fa6..3a1beda7 100644
--- a/recipes-misc/recipes-multimedia/zynaddsubfx/zynaddsubfx_3.0.1.bb
+++ b/recipes-misc/recipes-multimedia/zynaddsubfx/zynaddsubfx_3.0.1.bb
@@ -22,7 +22,7 @@ DEPENDS += " \
     libxpm \
 "
 
-CXXFLAGS += "-ffast-math"
+CXXFLAGS += "-ffast-math -DNDEBUG"
 
 SRC_URI = " \
     ${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}/${PV}/${BPN}-${PV}.tar.bz2 \