1 files changed, 1 insertions, 1 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 1d7bf5d53ec..70f426f95a6 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -575,7 +575,7 @@ struct glyph_pool
   struct glyph *glyphs;
 
   /* Allocated size of `glyphs'.  */
-  int nglyphs;
+  ptrdiff_t nglyphs;
 
   /* Number of rows and columns in a matrix.  */
   int nrows, ncolumns;