diff --git a/include/QF/simd/vec4d.h b/include/QF/simd/vec4d.h
index 1b8adbdfc..e73873bc0 100644
--- a/include/QF/simd/vec4d.h
+++ b/include/QF/simd/vec4d.h
@@ -244,7 +244,7 @@ qrotd (vec4d_t a, vec4d_t b)
 	vec4d_t mb = vsqrtd (dotd (b, b));
 	vec4d_t den = 2 * ma * mb;
 	vec4d_t t = mb * a + ma * b;
-	vec4d_t mba_mab = _mm256_sqrt_pd (dotd (t, t));
+	vec4d_t mba_mab = vsqrtd (dotd (t, t));
 	vec4d_t q = crossd (a, b) / mba_mab;
 	q[3] = (mba_mab / den)[0];
 	return q;
diff --git a/include/QF/simd/vec4f.h b/include/QF/simd/vec4f.h
index f3ea3b22f..85eb252eb 100644
--- a/include/QF/simd/vec4f.h
+++ b/include/QF/simd/vec4f.h
@@ -232,7 +232,7 @@ qrotf (vec4f_t a, vec4f_t b)
 	vec4f_t mb = vsqrtf (dotf (b, b));
 	vec4f_t den = 2 * ma * mb;
 	vec4f_t t = mb * a + ma * b;
-	vec4f_t mba_mab = _mm_sqrt_ps (dotf (t, t));
+	vec4f_t mba_mab = vsqrtf (dotf (t, t));
 	vec4f_t q = crossf (a, b) / mba_mab;
 	q[3] = (mba_mab / den)[0];
 	return q;