diff --git a/lib/config-utils.js b/lib/config-utils.js
index 8fbe2b068..e4a0035ac 100644
--- a/lib/config-utils.js
+++ b/lib/config-utils.js
@@ -136,6 +136,13 @@ function validateAndSanitisePath(originalPath, propertyName, configFile) {
         core.warning(getConfigFilePropertyError(configFile, propertyName, '"' + originalPath + '" contains an unsupported character. ' +
             'The filter pattern characters ?, +, [, ], ! are not supported and will be matched literally.'));
     }
+    // Ban any uses of backslash for now.
+    // This may not play nicely with project layouts.
+    // This restriction can be lifted later if we determine they are ok.
+    if (path.indexOf('\\') !== -1) {
+        throw new Error(getConfigFilePropertyError(configFile, propertyName, '"' + originalPath + '" contains an "\\" character. These are not allowed in filters. ' +
+            'If running on windows we recommend using "/" instead for path filters.'));
+    }
     return path;
 }
 exports.validateAndSanitisePath = validateAndSanitisePath;
diff --git a/lib/config-utils.js.map b/lib/config-utils.js.map
index 64adbadce..849ee689f 100644
--- a/lib/config-utils.js.map
+++ b/lib/config-utils.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/config-utils.ts b/src/config-utils.ts
index d4fc446c6..1835fe251 100644
--- a/src/config-utils.ts
+++ b/src/config-utils.ts
@@ -161,6 +161,17 @@ export function validateAndSanitisePath(
         'The filter pattern characters ?, +, [, ], ! are not supported and will be matched literally.'));
   }
 
+  // Ban any uses of backslash for now.
+  // This may not play nicely with project layouts.
+  // This restriction can be lifted later if we determine they are ok.
+  if (path.indexOf('\\') !== -1) {
+    throw new Error(getConfigFilePropertyError(
+      configFile,
+      propertyName,
+      '"' + originalPath + '" contains an "\\" character. These are not allowed in filters. ' +
+        'If running on windows we recommend using "/" instead for path filters.'));
+  }
+
   return path;
 }