diff --git a/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.js b/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.js
index 0bac7ae7b0f2..ea0d747de97f 100644
--- a/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.js
@@ -27,6 +27,7 @@ var pow = require( '@stdlib/math/base/special/pow' );
 var Complex128Array = require( '@stdlib/array/complex128' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var zrot = require( './../lib/zrot.js' );
 
@@ -107,7 +108,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':len='+len, f );
+		bench( format( '%s:len=%d', pkg, len ), f );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.ndarray.js b/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.ndarray.js
index 1e55a28db4cc..0d633206e4a9 100644
--- a/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.ndarray.js
+++ b/lib/node_modules/@stdlib/lapack/base/zrot/benchmark/benchmark.ndarray.js
@@ -27,6 +27,7 @@ var pow = require( '@stdlib/math/base/special/pow' );
 var Complex128Array = require( '@stdlib/array/complex128' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var zrot = require( './../lib/ndarray.js' );
 
@@ -107,7 +108,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':ndarray:len='+len, f );
+		bench( format( '%s:ndarray:len=%d', pkg, len ), f );
 	}
 }