diff --git a/include/libweston/libweston.h b/include/libweston/libweston.h
index 8dec6f85..4a6385b7 100644
--- a/include/libweston/libweston.h
+++ b/include/libweston/libweston.h
@@ -1639,14 +1639,6 @@ weston_view_from_global_fixed(struct weston_view *view,
 			      wl_fixed_t x, wl_fixed_t y,
 			      wl_fixed_t *vx, wl_fixed_t *vy);
 
-void
-weston_spring_init(struct weston_spring *spring,
-		   double k, double current, double target);
-void
-weston_spring_update(struct weston_spring *spring, const struct timespec *time);
-int
-weston_spring_done(struct weston_spring *spring);
-
 void
 weston_view_activate(struct weston_view *view,
 		     struct weston_seat *seat,
diff --git a/libweston/libweston-internal.h b/libweston/libweston-internal.h
index 0bbd2196..e5e63785 100644
--- a/libweston/libweston-internal.h
+++ b/libweston/libweston-internal.h
@@ -263,4 +263,15 @@ weston_surface_to_buffer_region(struct weston_surface *surface,
 				pixman_region32_t *buffer_region);
 void
 weston_surface_schedule_repaint(struct weston_surface *surface);
+
+/* weston_spring */
+
+void
+weston_spring_init(struct weston_spring *spring,
+		   double k, double current, double target);
+int
+weston_spring_done(struct weston_spring *spring);
+
+void
+weston_spring_update(struct weston_spring *spring, const struct timespec *time);
 #endif
diff --git a/libweston/zoom.c b/libweston/zoom.c
index 8d513c39..ac8f1f30 100644
--- a/libweston/zoom.c
+++ b/libweston/zoom.c
@@ -31,6 +31,7 @@
 #include <stdbool.h>
 
 #include <libweston/libweston.h>
+#include "libweston-internal.h"
 #include "text-cursor-position-server-protocol.h"
 #include "shared/helpers.h"