diff --git a/lib/main.js b/lib/main.js
index 1a31a4d..947984c 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -21,7 +21,7 @@
 // MODULES //
 
 var isFunction = require( '@stdlib/assert-is-function' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 
 
 // MAIN //
@@ -72,16 +72,16 @@ var format = require( '@stdlib/string-format' );
 */
 function ifthenAsync( predicate, x, y, done ) {
 	if ( !isFunction( predicate ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', predicate ) );
+		throw new TypeError( format( '1RH3c', predicate ) );
 	}
 	if ( !isFunction( x ) ) {
-		throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', x ) );
+		throw new TypeError( format( '1RH2H', x ) );
 	}
 	if ( !isFunction( y ) ) {
-		throw new TypeError( format( 'invalid argument. Third argument must be a function. Value: `%s`.', y ) );
+		throw new TypeError( format( '1RH3N', y ) );
 	}
 	if ( !isFunction( done ) ) {
-		throw new TypeError( format( 'invalid argument. Last argument must be a function. Value: `%s`.', done ) );
+		throw new TypeError( format( '1RH3q', done ) );
 	}
 	predicate( clbk1 );
 
diff --git a/package.json b/package.json
index 10c8596..1f5f9be 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "@stdlib/assert-is-function": "^0.2.2",
-    "@stdlib/string-format": "^0.2.2",
+    "@stdlib/error-tools-fmtprodmsg": "^0.2.2",
     "@stdlib/error-tools-fmtprodmsg": "^0.2.2"
   },
   "devDependencies": {