diff --git a/tools/build.sh b/tools/build.sh
index 2bf242d..99cc9a1 100644
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -286,7 +286,7 @@ install_artifacts() {
 }
 
 read_package_version_from_manifest() {
-  awk -F '"' '/^version\s*=\s*"/ { print $2; exit }' "$CRATE_MANIFEST"
+  awk -F '"' '/^[[:space:]]*version[[:space:]]*=[[:space:]]*"/ { print $2; exit }' "$CRATE_MANIFEST"
 }
 
 package_deb() {