diff --git a/paddle/scripts/infrt_build.sh b/paddle/scripts/infrt_build.sh
index 6634f5396ac74032a4c054a42258d6f9ffcdb62e..6b0611bf61cdc9654d41a3970a74abdd498b0007 100755
--- a/paddle/scripts/infrt_build.sh
+++ b/paddle/scripts/infrt_build.sh
@@ -81,6 +81,7 @@ function init() {
 }
 
 function infrt_gen_and_build() {
+    parallel_number=24
     if [ "$1" != "" ]; then
       parallel_number=$1
     fi