diff --git a/build/createIconSet.d.ts b/build/createIconSet.d.ts
index 2c70ec2..9ab570c 100644
--- a/build/createIconSet.d.ts
+++ b/build/createIconSet.d.ts
@@ -60,7 +60,7 @@ export interface IconButtonProps<GLYPHS extends string> extends IconProps<GLYPHS
     backgroundColor?: string | OpaqueColorValue;
 }
 export declare type GlyphMap<G extends string> = {
-    [K in G]: number;
+    [K in G]: number | string;
 };
 export interface Icon<G extends string, FN extends string> {
     defaultProps: any;
diff --git a/src/createIconSet.tsx b/src/createIconSet.tsx
index a7279bb..65c9e01 100644
--- a/src/createIconSet.tsx
+++ b/src/createIconSet.tsx
@@ -76,7 +76,7 @@ export interface IconButtonProps<GLYPHS extends string> extends IconProps<GLYPHS
   backgroundColor?: string | OpaqueColorValue;
 }
 
-export type GlyphMap<G extends string> = { [K in G]: number }
+export type GlyphMap<G extends string> = { [K in G]: number | string }
 
 export interface Icon<G extends string, FN extends string> {
   defaultProps: any;