diff --git a/bk_paper.c b/bk_paper.c
index 0b73d39..d72eff7 100644
--- a/bk_paper.c
+++ b/bk_paper.c
@@ -75,6 +75,8 @@
 #include "halibut.h"
 #include "paper.h"
 
+font_info *all_fonts;
+
 typedef struct paper_conf_Tag paper_conf;
 typedef struct paper_idx_Tag paper_idx;
 
diff --git a/paper.h b/paper.h
index 5a27277..e5aa9e7 100644
--- a/paper.h
+++ b/paper.h
@@ -78,7 +78,7 @@ struct ligature_Tag {
  * metrics are read in.
  */
 
-font_info *all_fonts;
+extern font_info *all_fonts;
 
 struct font_info_Tag {
     font_info *next;