diff --git a/tests/script/api/makefile b/tests/script/api/makefile
index 72b67848545478c934e0bf07fec0ccbb115a9723..2e9c46a3d9aef18cf4366044b77687237a622525 100644
--- a/tests/script/api/makefile
+++ b/tests/script/api/makefile
@@ -4,7 +4,7 @@
 ROOT=./
 TARGET=exe
 LFLAGS = '-Wl,-rpath,/usr/local/taos/driver/' -ltaos -lpthread -lm -lrt
-CFLAGS = -O3 -g -Wall -Wno-deprecated -fPIC -Wno-unused-result -Wconversion \
+CFLAGS = -O0 -g -Wall -Wno-deprecated -fPIC -Wno-unused-result -Wconversion \
 	-Wno-char-subscripts -D_REENTRANT -Wno-format -D_REENTRANT -DLINUX \
 	-Wno-unused-function -D_M_X64 -I/usr/local/taos/include -std=gnu99 \