1 files changed, 3 insertions, 1 deletions

diff --git a/minui/include/minui/minui.h b/minui/include/minui/minui.h
index f9da19999..e96b7ae08 100644
--- a/minui/include/minui/minui.h
+++ b/minui/include/minui/minui.h
@@ -66,8 +66,10 @@ void gr_texticon(int x, int y, GRSurface* icon);
 const GRFont* gr_sys_font();
 int gr_init_font(const char* name, GRFont** dest);
 void gr_text(const GRFont* font, int x, int y, const char* s, bool bold);
+// Return -1 if font is nullptr.
 int gr_measure(const GRFont* font, const char* s);
-void gr_font_size(const GRFont* font, int* x, int* y);
+// Return -1 if font is nullptr.
+int gr_font_size(const GRFont* font, int* x, int* y);
 
 void gr_blit(GRSurface* source, int sx, int sy, int w, int h, int dx, int dy);
 unsigned int gr_get_width(GRSurface* surface);