diff --git a/types/abbrev/index.d.ts b/types/abbrev/index.d.ts
index 0d55334d3f..09cfbea8b1 100644
--- a/types/abbrev/index.d.ts
+++ b/types/abbrev/index.d.ts
@@ -5,8 +5,8 @@
 
 export = abbrev;
 
-declare function abbrev(words: string[]): {[abbreviation: string]: string};
-declare function abbrev(...words: string[]): {[abbreviation: string]: string};
+declare function abbrev(words: string[]): { [abbreviation: string]: string };
+declare function abbrev(...words: string[]): { [abbreviation: string]: string };
 
 declare namespace abbrev {
     function monkeyPatch(): void;
@@ -14,14 +14,14 @@ declare namespace abbrev {
 
 declare global {
     interface Array<T> {
-        abbrev(): {[abbreviation: string]: string};
+        abbrev(): { [abbreviation: string]: string };
     }
 
     interface ReadonlyArray<T> {
-        abbrev(): {[abbreviation: string]: string};
+        abbrev(): { [abbreviation: string]: string };
     }
 
     interface Object {
-        abbrev(): {[abbreviation: string]: string};
+        abbrev(): { [abbreviation: string]: string };
     }
 }