diff --git a/blas/gonum/dtrmvbench_test.go b/blas/gonum/dtrmvbench_test.go
index 371c0192..c41ac601 100644
--- a/blas/gonum/dtrmvbench_test.go
+++ b/blas/gonum/dtrmvbench_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package gonum
 
 import (
diff --git a/blas/gonum/level2cmplx128_bench_test.go b/blas/gonum/level2cmplx128_bench_test.go
index 915a1918..08365d58 100644
--- a/blas/gonum/level2cmplx128_bench_test.go
+++ b/blas/gonum/level2cmplx128_bench_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package gonum
 
 import (
diff --git a/graph/path/control_flow_bench_test.go b/graph/path/control_flow_bench_test.go
index 379238c7..1345dfa6 100644
--- a/graph/path/control_flow_bench_test.go
+++ b/graph/path/control_flow_bench_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package path
 
 import (
diff --git a/internal/asm/c128/benchDot_test.go b/internal/asm/c128/benchDot_test.go
index 5134607e..feb48270 100644
--- a/internal/asm/c128/benchDot_test.go
+++ b/internal/asm/c128/benchDot_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package c128
 
 import (
diff --git a/internal/asm/c64/benchDot_test.go b/internal/asm/c64/benchDot_test.go
index 3ec47720..b0771a82 100644
--- a/internal/asm/c64/benchDot_test.go
+++ b/internal/asm/c64/benchDot_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package c64
 
 import (
diff --git a/internal/asm/f32/benchDot_test.go b/internal/asm/f32/benchDot_test.go
index f12f9014..cbc73bbc 100644
--- a/internal/asm/f32/benchDot_test.go
+++ b/internal/asm/f32/benchDot_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package f32
 
 import (
diff --git a/internal/asm/f64/benchAxpy_test.go b/internal/asm/f64/benchAxpy_test.go
index 7bd3dca7..5f192f31 100644
--- a/internal/asm/f64/benchAxpy_test.go
+++ b/internal/asm/f64/benchAxpy_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package f64
 
 import (
diff --git a/internal/asm/f64/benchScal_test.go b/internal/asm/f64/benchScal_test.go
index b4fb19ad..7d3092f4 100644
--- a/internal/asm/f64/benchScal_test.go
+++ b/internal/asm/f64/benchScal_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package f64
 
 import (
diff --git a/lapack/gonum/bench_test.go b/lapack/gonum/bench_test.go
index 6f945cac..ed9acfa4 100644
--- a/lapack/gonum/bench_test.go
+++ b/lapack/gonum/bench_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package gonum
 
 import (
diff --git a/lapack/testlapack/dgeev_bench.go b/lapack/testlapack/dgeev_bench.go
index 177807de..b728c1d8 100644
--- a/lapack/testlapack/dgeev_bench.go
+++ b/lapack/testlapack/dgeev_bench.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package testlapack
 
 import (