diff --git a/packages/apollo-cache-inmemory/src/fragmentMatcher.ts b/packages/apollo-cache-inmemory/src/fragmentMatcher.ts
index 4ae8943cb2a..87c416be87e 100644
--- a/packages/apollo-cache-inmemory/src/fragmentMatcher.ts
+++ b/packages/apollo-cache-inmemory/src/fragmentMatcher.ts
@@ -77,10 +77,11 @@ export class HeuristicFragmentMatcher implements FragmentMatcherInterface {
     // If it's 1, we don't want to return anything, if it's 2 we want to match. We can't tell the
     // difference, so we warn the user, but still try to match it (backcompat).
     warnOnceInDevelopment(
-      `You are using the simple (heuristic) fragment matcher, but your queries contain union or interface types.
-     Apollo Client will not be able to accurately map fragments. ` +
-        `To make this error go away, use the IntrospectionFragmentMatcher as described in the docs: ` +
-        `https://www.apollographql.com/docs/react/recipes/fragment-matching.html`,
+      'You are using the simple (heuristic) fragment matcher, but your ' +
+      'queries contain union or interface types. Apollo Client will not be ' +
+      'able to accurately map fragments. To make this error go away, use ' +
+      'the `IntrospectionFragmentMatcher` as described in the docs: ' +
+      'https://www.apollographql.com/docs/react/recipes/fragment-matching.html',
       'error',
     );