diff --git a/aegisub/libass/ass_parse.h b/aegisub/libass/ass_parse.h
index eac2baeef..e4b37487f 100644
--- a/aegisub/libass/ass_parse.h
+++ b/aegisub/libass/ass_parse.h
@@ -30,8 +30,8 @@ void update_font(ASS_Renderer *render_priv);
 void change_border(ASS_Renderer *render_priv, double border_x,
                    double border_y);
 unsigned get_next_char(ASS_Renderer *render_priv, char **str);
-inline void change_alpha(uint32_t *var, uint32_t new, double pwr);
-inline uint32_t mult_alpha(uint32_t a, uint32_t b);
+extern void change_alpha(uint32_t *var, uint32_t new, double pwr);
+extern uint32_t mult_alpha(uint32_t a, uint32_t b);
 
 
 #endif /* LIBASS_PARSE_H */