diff --git a/util/ncgg/proto.make b/util/ncgg/proto.make
index d580cef02..9adc5cd46 100644
--- a/util/ncgg/proto.make
+++ b/util/ncgg/proto.make
@@ -21,7 +21,7 @@ SOURCES=$(SRC_DIR)/*.h $(SRC_DIR)/cgg.y $(SRC_DIR)/scan.l \
 SRC_DIR=$(SRC_HOME)/util/ncgg
 EMH=$(TARGET_HOME)/h
 INCLUDES=-I$(EMH) -I$(TARGET_HOME)/config -I$(SRC_DIR) -I.
-CFLAGS=$(INCLUDES) $(COPTIONS)
+CFLAGS=$(INCLUDES) $(COPTIONS) -DNDEBUG
 YFLAGS=-d
 LDFLAGS=$(LDOPTIONS)
 LINTFLAGS=$(INCLUDES) $(LINTOPTIONS)