diff --git a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.js
index 3064f1c2def6..e17079b9fde3 100644
--- a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.js
@@ -25,6 +25,7 @@ var normal = require( '@stdlib/random/array/normal' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var Results = require( '@stdlib/stats/base/ztest/one-sample/results/float64' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var dztest = require( './../lib/dztest.js' );
 
@@ -101,7 +102,7 @@ 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/stats/strided/dztest/benchmark/benchmark.native.js b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.native.js
index f584888b2986..22cf7fad32ad 100644
--- a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.native.js
+++ b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.native.js
@@ -27,6 +27,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var Results = require( '@stdlib/stats/base/ztest/one-sample/results/float64' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 
 
@@ -106,7 +107,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+'::native:len='+len, opts, f );
+		bench( format( '%s::native:len=%d', pkg, len ), opts, f );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.js b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.js
index fc391a105b51..a3663a18696f 100644
--- a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.js
+++ b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.js
@@ -25,6 +25,7 @@ var normal = require( '@stdlib/random/array/normal' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var Results = require( '@stdlib/stats/base/ztest/one-sample/results/float64' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var dztest = require( './../lib/ndarray.js' );
 
@@ -101,7 +102,7 @@ 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 );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.native.js b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.native.js
index 7b4e9cced129..07ce1a15bafe 100644
--- a/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.native.js
+++ b/lib/node_modules/@stdlib/stats/strided/dztest/benchmark/benchmark.ndarray.native.js
@@ -27,6 +27,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var Results = require( '@stdlib/stats/base/ztest/one-sample/results/float64' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 
 
@@ -106,7 +107,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+'::native:ndarray:len='+len, opts, f );
+		bench( format( '%s::native:ndarray:len=%d', pkg, len ), opts, f );
 	}
 }