diff --git a/internal/pkg/config/manifest.go b/internal/pkg/config/manifest.go
index 000aa08..f6cf11e 100644
--- a/internal/pkg/config/manifest.go
+++ b/internal/pkg/config/manifest.go
@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/ghodss/yaml"
 	"github.com/kristofferahl/go-centry/internal/pkg/cmd"
@@ -78,6 +79,10 @@ type LogConfig struct {
 
 // LoadManifest reads, parses and returns a manifest root object
 func LoadManifest(manifest string) (*Manifest, error) {
+	if !strings.HasSuffix(manifest, ".yaml") && !strings.HasSuffix(manifest, ".yml") {
+		return nil, fmt.Errorf("manifest file must have a valid extension (yaml,yml)")
+	}
+
 	mp, _ := filepath.Abs(manifest)
 
 	if _, err := os.Stat(mp); os.IsNotExist(err) {
diff --git a/internal/pkg/config/manifest_test.go b/internal/pkg/config/manifest_test.go
index 4bc3718..7bc3bd0 100644
--- a/internal/pkg/config/manifest_test.go
+++ b/internal/pkg/config/manifest_test.go
@@ -33,10 +33,17 @@ func TestManifest(t *testing.T) {
 		})
 
 		g.It("returns error when path is invalid", func() {
-			m, err := LoadManifest("foo")
+			m, err := LoadManifest("foo.yaml")
 			g.Assert(m == nil).IsTrue("exected manifest to be nil")
 			g.Assert(err != nil).IsTrue("expected error")
-			g.Assert(err.Error()).Equal("manifest file not found (path=foo)")
+			g.Assert(err.Error()).Equal("manifest file not found (path=foo.yaml)")
+		})
+
+		g.It("returns error when path is not a yaml or yml file", func() {
+			m, err := LoadManifest("foo.bar")
+			g.Assert(m == nil).IsTrue("exected manifest to be nil")
+			g.Assert(err != nil).IsTrue("expected error")
+			g.Assert(err.Error()).Equal("manifest file must have a valid extension (yaml,yml)")
 		})
 	})