diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 29cbc8abdf..6e212a63a6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,6 +18,7 @@ jobs:
     timeout-minutes: 121
     env:
       VFLAGS: -cc tcc -no-retry-compilation
+      V_CI_CSTRICT: 1
     steps:
       - uses: actions/checkout@v2
       - name: Install dependencies
diff --git a/vlib/v/compiler_errors_test.v b/vlib/v/compiler_errors_test.v
index bd2ac58728..55f6f72f41 100644
--- a/vlib/v/compiler_errors_test.v
+++ b/vlib/v/compiler_errors_test.v
@@ -11,8 +11,14 @@ const skip_files = [
 	'non_existing.vv', // minimize commit diff churn, do not remove
 ]
 
+const skip_on_cstrict = [
+	'vlib/v/checker/tests/missing_c_lib_header_1.vv',
+	'vlib/v/checker/tests/missing_c_lib_header_with_explanation_2.vv',
+]
+
 const skip_on_ubuntu_musl = [
 	'vlib/v/checker/tests/vweb_tmpl_used_var.vv',
+	'vlib/v/checker/tests/vweb_routing_checks.vv',
 ]
 
 const vexe = os.getenv('VEXE')
@@ -31,6 +37,8 @@ const github_job = os.getenv('GITHUB_JOB')
 
 const v_ci_ubuntu_musl = os.getenv('V_CI_UBUNTU_MUSL').len > 0
 
+const v_ci_cstrict = os.getenv('V_CI_CSTRICT').len > 0
+
 struct TaskDescription {
 	vexe             string
 	evars            string
@@ -198,6 +206,9 @@ fn (mut tasks Tasks) run() {
 	if v_ci_ubuntu_musl {
 		m_skip_files << skip_on_ubuntu_musl
 	}
+	if v_ci_cstrict {
+		m_skip_files << skip_on_cstrict
+	}
 	$if noskip ? {
 		m_skip_files = []
 	}