diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index b06449bd..b73138c8 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -439,7 +439,7 @@ tp_unpin_finger(struct tp_dispatch *tp, struct tp_touch *t)
 	ydist *= tp->buttons.motion_dist.y_scale_coeff;
 
 	/* 3mm movement -> unpin */
-	if (vector_length(xdist, ydist) >= 3.0) {
+	if (hypot(xdist, ydist) >= 3.0) {
 		t->pinned.is_pinned = false;
 		return;
 	}
diff --git a/src/libinput-util.h b/src/libinput-util.h
index f27bcfd4..b18aece5 100644
--- a/src/libinput-util.h
+++ b/src/libinput-util.h
@@ -299,10 +299,4 @@ int parse_mouse_wheel_click_angle_property(const char *prop);
 double parse_trackpoint_accel_property(const char *prop);
 bool parse_dimension_property(const char *prop, size_t *width, size_t *height);
 
-static inline double
-vector_length(double x, double y)
-{
-	return sqrt(x * x + y * y);
-}
-
 #endif /* LIBINPUT_UTIL_H */
diff --git a/test/pointer.c b/test/pointer.c
index 28d7c9a6..c781505f 100644
--- a/test/pointer.c
+++ b/test/pointer.c
@@ -197,7 +197,7 @@ START_TEST(pointer_motion_relative_min_decel)
 	ck_assert((evx == 0.0) == (dx == 0));
 	ck_assert((evy == 0.0) == (dy == 0));
 
-	len = vector_length(evx, evy);
+	len = hypot(evx, evy);
 	ck_assert(fabs(len) >= 0.3);
 
 	libinput_event_destroy(event);