diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 6d737e8ed..dcb9edf66 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -76,6 +76,12 @@ jobs:
         php-version: ${{ matrix.php-version }}
     - run: make --directory=site check-application-mapping
 
+  check-sri-macros-concat:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+    - run: make --directory=site check-sri-macros-concat
+
   lint-php:
     runs-on: ubuntu-latest
     strategy:
diff --git a/site/Makefile b/site/Makefile
index 859702055..500c7ff20 100644
--- a/site/Makefile
+++ b/site/Makefile
@@ -1,6 +1,6 @@
-.PHONY: test composer-audit npm-audit cs-fix check-file-patterns check-makefile check-application-mapping lint-php lint-latte lint-neon lint-xml lint-xml-auto-install phpcs phpstan phpstan-latte-templates phpstan-vendor psalm tester tester-include-skipped gitleaks composer-dependency-analyser
+.PHONY: test composer-audit npm-audit cs-fix check-file-patterns check-makefile check-application-mapping check-sri-macros-concat lint-php lint-latte lint-neon lint-xml lint-xml-auto-install phpcs phpstan phpstan-latte-templates phpstan-vendor psalm tester tester-include-skipped gitleaks composer-dependency-analyser
 
-test: composer-audit npm-audit check-file-patterns check-makefile check-application-mapping lint-php lint-latte lint-neon lint-xml phpcs phpstan tester psalm phpstan-vendor composer-dependency-analyser
+test: composer-audit npm-audit check-file-patterns check-makefile check-application-mapping check-sri-macros-concat lint-php lint-latte lint-neon lint-xml phpcs phpstan tester psalm phpstan-vendor composer-dependency-analyser
 
 composer-audit:
 	composer audit
@@ -20,6 +20,9 @@ check-makefile:
 check-application-mapping:
 	bin/check-application-mapping.php
 
+check-sri-macros-concat:
+	bin/check-sri-macros-concat.sh
+
 lint-php:
 	vendor/php-parallel-lint/php-parallel-lint/parallel-lint --colors -e php,phtml,phpt,phpstub app/ public/ stubs/ tests/
 
diff --git a/site/bin/check-sri-macros-concat.sh b/site/bin/check-sri-macros-concat.sh
new file mode 100755
index 000000000..ca8d7a754
--- /dev/null
+++ b/site/bin/check-sri-macros-concat.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+echo "Wrong spaze/sri-macros concatenations (without spaces, e.g. {script foo+bar}):"
+
+BAD_LINES=$(grep --recursive --perl-regexp --ignore-case --line-number "{(script|stylesheet)" app/ | grep --perl-regexp "[^\s]\+|\+[^\s]")
+if [ "$BAD_LINES" ]; then
+	echo "$BAD_LINES" | grep --color ".+."
+	exit 1
+else
+	echo "None, all have spaces around the plus sign (foo + bar, not foo+bar)"
+	exit 0
+fi