diff --git a/dist/index.js b/dist/index.js
index c2c74d562..ef8dc9a1c 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -273,8 +273,14 @@ function toChangedFilesMatchConfig(config) {
         else {
             // If it is not an array of strings then it should be array of further config options
             // so assign them to our `changedFilesMatchConfig`
-            changedFilesConfig.forEach(element => {
-                Object.assign(changedFilesMatchConfig.changedFiles, element);
+            changedFilesConfig.forEach(config => {
+                // Make sure that the values that we assign to our match config are an array
+                Object.entries(config).forEach(([key, value]) => {
+                    const element = {
+                        [key]: Array.isArray(value) ? value : [value]
+                    };
+                    Object.assign(changedFilesMatchConfig.changedFiles, element);
+                });
             });
         }
     }
diff --git a/src/labeler.ts b/src/labeler.ts
index 1510d1cde..9d20e65df 100644
--- a/src/labeler.ts
+++ b/src/labeler.ts
@@ -173,8 +173,14 @@ function toChangedFilesMatchConfig(config: any): ChangedFilesMatchConfig {
     } else {
       // If it is not an array of strings then it should be array of further config options
       // so assign them to our `changedFilesMatchConfig`
-      changedFilesConfig.forEach(element => {
-        Object.assign(changedFilesMatchConfig.changedFiles, element);
+      changedFilesConfig.forEach(config => {
+        // Make sure that the values that we assign to our match config are an array
+        Object.entries(config).forEach(([key, value]) => {
+          const element = {
+            [key]: Array.isArray(value) ? value : [value]
+          };
+          Object.assign(changedFilesMatchConfig.changedFiles, element);
+        });
       });
     }
   }