diff --git a/intern/cycles/util/util_math.h b/intern/cycles/util/util_math.h
index 1e8d8f37d1e..c332e1709db 100644
--- a/intern/cycles/util/util_math.h
+++ b/intern/cycles/util/util_math.h
@@ -1419,10 +1419,12 @@ ccl_device bool map_to_sphere(float *r_u, float *r_v,
 {
 	float len = sqrtf(x * x + y * y + z * z);
 	if(len > 0.0f) {
-		if(x == 0.0f && y == 0.0f)
+		if(UNLIKELY(x == 0.0f && y == 0.0f)) {
 			*r_u = 0.0f;  /* othwise domain error */
-		else
+		}
+		else {
 			*r_u = (1.0f - atan2f(x, y) / M_PI_F) / 2.0f;
+		}
 		*r_v = 1.0f - safe_acosf(z / len) / M_PI_F;
 		return true;
 	}
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c
index 1cd1d1875fc..17a1dcbf34d 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -3206,8 +3206,12 @@ void map_to_sphere(float *r_u, float *r_v, const float x, const float y, const f
 
 	len = sqrtf(x * x + y * y + z * z);
 	if (len > 0.0f) {
-		if (x == 0.0f && y == 0.0f) *r_u = 0.0f;  /* othwise domain error */
-		else *r_u = (1.0f - atan2f(x, y) / (float)M_PI) / 2.0f;
+		if (UNLIKELY(x == 0.0f && y == 0.0f)) {
+			*r_u = 0.0f;  /* othwise domain error */
+		}
+		else {
+			*r_u = (1.0f - atan2f(x, y) / (float)M_PI) / 2.0f;
+		}
 
 		*r_v = 1.0f - saacos(z / len) / (float)M_PI;
 	}