diff --git a/scripts/function-ios.sh b/scripts/function-ios.sh
index 37d8b05..e0101af 100755
--- a/scripts/function-ios.sh
+++ b/scripts/function-ios.sh
@@ -378,7 +378,7 @@ get_ldflags() {
 
 set_toolchain_paths() {
   if [ ! -f "${FFMPEG_KIT_TMPDIR}/gas-preprocessor.pl" ]; then
-    DOWNLOAD_RESULT=$(download "https://github.com/tanersener/gas-preprocessor/raw/master/gas-preprocessor.pl" "gas-preprocessor.pl" "exit")
+    DOWNLOAD_RESULT=$(download "https://github.com/tanersener/gas-preprocessor/raw/v20210917/gas-preprocessor.pl" "gas-preprocessor.pl" "exit")
     if [[ ${DOWNLOAD_RESULT} -ne 0 ]]; then
       exit 1
     fi
diff --git a/scripts/function-macos.sh b/scripts/function-macos.sh
index 9c53a92..cd6ea26 100755
--- a/scripts/function-macos.sh
+++ b/scripts/function-macos.sh
@@ -299,7 +299,7 @@ get_ldflags() {
 
 set_toolchain_paths() {
   if [ ! -f "${FFMPEG_KIT_TMPDIR}/gas-preprocessor.pl" ]; then
-    DOWNLOAD_RESULT=$(download "https://github.com/tanersener/gas-preprocessor/raw/master/gas-preprocessor.pl" "gas-preprocessor.pl" "exit")
+    DOWNLOAD_RESULT=$(download "https://github.com/tanersener/gas-preprocessor/raw/v20210917/gas-preprocessor.pl" "gas-preprocessor.pl" "exit")
     if [[ ${DOWNLOAD_RESULT} -ne 0 ]]; then
       exit 1
     fi
diff --git a/scripts/function-tvos.sh b/scripts/function-tvos.sh
index cc87adc..f198cc8 100755
--- a/scripts/function-tvos.sh
+++ b/scripts/function-tvos.sh
@@ -350,7 +350,7 @@ get_ldflags() {
 
 set_toolchain_paths() {
   if [ ! -f "${FFMPEG_KIT_TMPDIR}/gas-preprocessor.pl" ]; then
-    DOWNLOAD_RESULT=$(download "https://github.com/tanersener/gas-preprocessor/raw/master/gas-preprocessor.pl" "gas-preprocessor.pl" "exit")
+    DOWNLOAD_RESULT=$(download "https://github.com/tanersener/gas-preprocessor/raw/v20210917/gas-preprocessor.pl" "gas-preprocessor.pl" "exit")
     if [[ ${DOWNLOAD_RESULT} -ne 0 ]]; then
       exit 1
     fi