diff --git a/lib/main.js b/lib/main.js
index d5824e8..f1b3496 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -23,7 +23,7 @@
 var isString = require( '@stdlib/assert-is-string' ).isPrimitive;
 var parse = require( '@stdlib/complex-base-parse' );
 var Complex128 = require( '@stdlib/complex-float64-ctor' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 
 
 // MAIN //
@@ -45,7 +45,7 @@ function parseComplex128( str ) {
 	var v;
 
 	if ( !isString( str ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
+		throw new TypeError( format( 'null3F', str ) );
 	}
 	v = parse( str );
 	if ( v === null ) {
diff --git a/package.json b/package.json
index bd9007c..27b3953 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "@stdlib/assert-is-string": "^0.2.3",
     "@stdlib/complex-base-parse": "^0.1.2",
     "@stdlib/complex-float64-ctor": "^0.1.2",
-    "@stdlib/string-format": "^0.2.3",
+    "@stdlib/error-tools-fmtprodmsg": "^0.2.3",
     "@stdlib/types": "^0.5.1",
     "@stdlib/error-tools-fmtprodmsg": "^0.2.3"
   },