diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3513a17..97174b2 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -33,4 +33,4 @@ jobs:
       uses: actions/upload-artifact@v3
       with:
         name: pecl_package_${{ steps.tag.outputs.release_tag }}
-        path: awscrt-${{ steps.tag.outputs.release_tag }}.tgz
\ No newline at end of file
+        path: awscrt-${{ steps.tag.outputs.release_tag }}.tgz
diff --git a/Makefile.frag b/Makefile.frag
index bf479fb..a1414a7 100644
--- a/Makefile.frag
+++ b/Makefile.frag
@@ -1,6 +1,6 @@
 
 INT_DIR=build/install
-GENERATE_STUBS=$(expr `php --version | head -1 | cut -f 2 -d' '` \>= 7.1)
+GENERATE_STUBS=$(shell expr `php --version | head -1 | cut -f 2 -d' '` \>= 7.1)
 
 CMAKE = cmake3
 ifeq (, $(shell which cmake3))