diff --git a/lapack/testlapack/dgebak.go b/lapack/testlapack/dgebak.go
index 1e193956..1803c7ac 100644
--- a/lapack/testlapack/dgebak.go
+++ b/lapack/testlapack/dgebak.go
@@ -85,7 +85,7 @@ func testDgebak(t *testing.T, impl Dgebaker, job lapack.BalanceJob, side lapack.
 	got := cloneGeneral(v)
 	impl.Dgebak(job, side, n, ilo, ihi, scale, m, got.Data, got.Stride)
 
-	prefix := fmt.Sprintf("Case job=%v, side=%v, n=%v, ilo=%v, ihi=%v, m=%v, extra=%v",
+	prefix := fmt.Sprintf("Case job=%c, side=%c, n=%v, ilo=%v, ihi=%v, m=%v, extra=%v",
 		job, side, n, ilo, ihi, m, extra)
 
 	if !generalOutsideAllNaN(got) {
diff --git a/lapack/testlapack/dgebal.go b/lapack/testlapack/dgebal.go
index 2818270d..c4fb76a6 100644
--- a/lapack/testlapack/dgebal.go
+++ b/lapack/testlapack/dgebal.go
@@ -49,7 +49,7 @@ func testDgebal(t *testing.T, impl Dgebaler, job lapack.BalanceJob, a blas64.Gen
 
 	ilo, ihi := impl.Dgebal(job, n, a.Data, a.Stride, scale)
 
-	prefix := fmt.Sprintf("Case job=%v, n=%v, extra=%v", job, n, extra)
+	prefix := fmt.Sprintf("Case job=%c, n=%v, extra=%v", job, n, extra)
 
 	if !generalOutsideAllNaN(a) {
 		t.Errorf("%v: out-of-range write to A\n%v", prefix, a.Data)
diff --git a/lapack/testlapack/dgecon.go b/lapack/testlapack/dgecon.go
index e940a699..c5007578 100644
--- a/lapack/testlapack/dgecon.go
+++ b/lapack/testlapack/dgecon.go
@@ -63,7 +63,7 @@ func dgeconTest(t *testing.T, impl Dgeconer, rnd *rand.Rand, n, lda int) {
 	}
 
 	for _, norm := range []lapack.MatrixNorm{lapack.MaxColumnSum, lapack.MaxRowSum} {
-		name := fmt.Sprintf("norm%v,n=%v,lda=%v", string(norm), n, lda)
+		name := fmt.Sprintf("norm=%v,n=%v,lda=%v", string(norm), n, lda)
 
 		// Compute the norm of A and A^{-1}.
 		aNorm := impl.Dlange(norm, n, n, a, lda, work)
diff --git a/lapack/testlapack/dgeev.go b/lapack/testlapack/dgeev.go
index ad8894b9..44d837ed 100644
--- a/lapack/testlapack/dgeev.go
+++ b/lapack/testlapack/dgeev.go
@@ -590,7 +590,7 @@ func testDgeev(t *testing.T, impl Dgeever, tc string, test dgeevTest, jobvl lapa
 	first := impl.Dgeev(jobvl, jobvr, n, a.Data, a.Stride, wr, wi,
 		vl.Data, vl.Stride, vr.Data, vr.Stride, work, len(work))
 
-	prefix := fmt.Sprintf("Case #%v: n=%v, jobvl=%v, jobvr=%v, extra=%v, work=%v",
+	prefix := fmt.Sprintf("Case #%v: n=%v, jobvl=%c, jobvr=%c, extra=%v, work=%v",
 		tc, n, jobvl, jobvr, extra, wl)
 
 	if !generalOutsideAllNaN(vl) {
diff --git a/lapack/testlapack/dhseqr.go b/lapack/testlapack/dhseqr.go
index 1db46677..73ebcab0 100644
--- a/lapack/testlapack/dhseqr.go
+++ b/lapack/testlapack/dhseqr.go
@@ -75,7 +75,7 @@ func testDhseqr(t *testing.T, impl Dhseqrer, i int, test dhseqrTest, job lapack.
 	}
 
 	unconverged := impl.Dhseqr(job, compz, n, ilo, ihi, h.Data, h.Stride, wr, wi, z.Data, z.Stride, work, len(work))
-	prefix := fmt.Sprintf("Case %v: job=%v, compz=%v, n=%v, ilo=%v, ihi=%v, extra=%v, optwk=%v",
+	prefix := fmt.Sprintf("Case %v: job=%c, compz=%c, n=%v, ilo=%v, ihi=%v, extra=%v, optwk=%v",
 		i, job, compz, n, ilo, ihi, extra, optwork)
 	if unconverged > 0 {
 		t.Logf("%v: Dhseqr did not compute all eigenvalues. unconverged=%v", prefix, unconverged)
diff --git a/lapack/testlapack/dlaln2.go b/lapack/testlapack/dlaln2.go
index ea8b9372..30c45956 100644
--- a/lapack/testlapack/dlaln2.go
+++ b/lapack/testlapack/dlaln2.go
@@ -55,7 +55,7 @@ func testDlaln2(t *testing.T, impl Dlaln2er, trans bool, na, nw, extra int, rnd
 
 	scale, xnormGot, ok := impl.Dlaln2(trans, na, nw, smin, ca, a.Data, a.Stride, d1, d2, b.Data, b.Stride, real(w), imag(w), x.Data, x.Stride)
 
-	prefix := fmt.Sprintf("Case trans=%v, na=%v, nw=%v, extra=%v", trans, na, nw, extra)
+	prefix := fmt.Sprintf("Case trans=%t, na=%v, nw=%v, extra=%v", trans, na, nw, extra)
 
 	if !generalOutsideAllNaN(a) {
 		t.Errorf("%v: out-of-range write to A\n%v", prefix, a.Data)
diff --git a/lapack/testlapack/dlarfx.go b/lapack/testlapack/dlarfx.go
index 723d894e..85a277cd 100644
--- a/lapack/testlapack/dlarfx.go
+++ b/lapack/testlapack/dlarfx.go
@@ -77,7 +77,7 @@ func testDlarfx(t *testing.T, impl Dlarfxer, side blas.Side, m, n, extra int, rn
 
 	impl.Dlarfx(side, m, n, v, tau, c.Data, c.Stride, work)
 
-	prefix := fmt.Sprintf("Case side=%v, m=%v, n=%v, extra=%v", side, m, n, extra)
+	prefix := fmt.Sprintf("Case side=%c, m=%v, n=%v, extra=%v", side, m, n, extra)
 
 	// Check any invalid modifications of c.
 	if !generalOutsideAllNaN(c) {
diff --git a/lapack/testlapack/dlaset.go b/lapack/testlapack/dlaset.go
index cb2e6156..f0135f4b 100644
--- a/lapack/testlapack/dlaset.go
+++ b/lapack/testlapack/dlaset.go
@@ -43,7 +43,7 @@ func DlasetTest(t *testing.T, impl Dlaseter) {
 
 				impl.Dlaset(uplo, m, n, alpha, beta, a.Data, a.Stride)
 
-				prefix := fmt.Sprintf("Case #%v: m=%v,n=%v,uplo=%v,extra=%v",
+				prefix := fmt.Sprintf("Case #%v: m=%v,n=%v,uplo=%c,extra=%v",
 					ti, m, n, uplo, extra)
 				if !generalOutsideAllNaN(a) {
 					t.Errorf("%v: out-of-range write to A", prefix)
diff --git a/lapack/testlapack/dlatrs.go b/lapack/testlapack/dlatrs.go
index 6d0bbda1..66f13b1e 100644
--- a/lapack/testlapack/dlatrs.go
+++ b/lapack/testlapack/dlatrs.go
@@ -59,7 +59,7 @@ func testDlatrs(t *testing.T, impl Dlatrser, imat int, uplo blas.Uplo, trans bla
 	// Call Dlatrs with normin=false.
 	copy(x, b)
 	scale := impl.Dlatrs(uplo, trans, diag, false, n, a, lda, x, cnorm)
-	prefix := fmt.Sprintf("Case imat=%v (n=%v,lda=%v,trans=%v,uplo=%v,diag=%v", imat, n, lda, trans, uplo, diag)
+	prefix := fmt.Sprintf("Case imat=%v (n=%v,lda=%v,trans=%c,uplo=%c,diag=%c", imat, n, lda, trans, uplo, diag)
 	for i, v := range cnorm {
 		if math.IsNaN(v) {
 			t.Errorf("%v: cnorm[%v] not computed (scale=%v,normin=false)", prefix, i, scale)
diff --git a/lapack/testlapack/dormhr.go b/lapack/testlapack/dormhr.go
index af13d21b..d3bdd139 100644
--- a/lapack/testlapack/dormhr.go
+++ b/lapack/testlapack/dormhr.go
@@ -116,7 +116,7 @@ func testDormhr(t *testing.T, impl Dormhrer, side blas.Side, trans blas.Transpos
 	impl.Dormhr(side, trans, m, n, ilo, ihi, a.Data, a.Stride, tau, c.Data, c.Stride, work, len(work))
 
 	// Compare the two answers.
-	prefix := fmt.Sprintf("Case side=%v, trans=%v, m=%v, n=%v, ilo=%v, ihi=%v, extra=%v, optwork=%v",
+	prefix := fmt.Sprintf("Case side=%c, trans=%c, m=%v, n=%v, ilo=%v, ihi=%v, extra=%v, optwork=%v",
 		side, trans, m, n, ilo, ihi, extra, optwork)
 	if !generalOutsideAllNaN(c) {
 		t.Errorf("%v: out-of-range write to C\n%v", prefix, c.Data)
diff --git a/lapack/testlapack/dsytrd.go b/lapack/testlapack/dsytrd.go
index 22237586..19927b3c 100644
--- a/lapack/testlapack/dsytrd.go
+++ b/lapack/testlapack/dsytrd.go
@@ -84,7 +84,7 @@ func DsytrdTest(t *testing.T, impl Dsytrder) {
 
 				impl.Dsytrd(uplo, n, a.Data, a.Stride, d, e, tau, work, lwork)
 
-				prefix := fmt.Sprintf("Case #%v: uplo=%v,n=%v,lda=%v,work=%v",
+				prefix := fmt.Sprintf("Case #%v: uplo=%c,n=%v,lda=%v,work=%v",
 					tc, uplo, n, lda, wl)
 
 				if !generalOutsideAllNaN(a) {