diff --git a/ChangeLog b/ChangeLog
index 1c749f962..8d67fcb5a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2017-08-25  Alexei Podtelezhnikov  <apodtele@gmail.com>
+
+	Swap `ALLOC_MULT' arguments (#51833).
+
+	* src/base/ftbitmap.c (ft_bitmap_assure_buffer): Updated.
+	* src/winfonts/winfnt.c (FNT_Load_Glyph): Updated.
+	* src/raster/ftrend1.c (ft_raster1_render): Updated.
+
 2017-08-23  Werner Lemberg  <wl@gnu.org>
 
 	[sfnt] Fix clang compilation (#51788).
diff --git a/src/base/ftbitmap.c b/src/base/ftbitmap.c
index 88c88c4c1..ee50c2f30 100644
--- a/src/base/ftbitmap.c
+++ b/src/base/ftbitmap.c
@@ -226,7 +226,7 @@
     }
 
     /* otherwise allocate new buffer */
-    if ( FT_QALLOC_MULT( buffer, new_pitch, bitmap->rows + ypixels ) )
+    if ( FT_QALLOC_MULT( buffer, bitmap->rows + ypixels, new_pitch ) )
       return error;
 
     /* new rows get added at the top of the bitmap, */
diff --git a/src/raster/ftrend1.c b/src/raster/ftrend1.c
index e52ca1db5..185a7f6fc 100644
--- a/src/raster/ftrend1.c
+++ b/src/raster/ftrend1.c
@@ -189,7 +189,7 @@
     bitmap->rows  = height;
     bitmap->pitch = (int)pitch;
 
-    if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) )
+    if ( FT_ALLOC_MULT( bitmap->buffer, height, pitch ) )
       goto Exit;
 
     slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
diff --git a/src/winfonts/winfnt.c b/src/winfonts/winfnt.c
index 5cdb85a36..4c4796231 100644
--- a/src/winfonts/winfnt.c
+++ b/src/winfonts/winfnt.c
@@ -1091,7 +1091,7 @@
 
       /* note: since glyphs are stored in columns and not in rows we */
       /*       can't use ft_glyphslot_set_bitmap                     */
-      if ( FT_ALLOC_MULT( bitmap->buffer, pitch, bitmap->rows ) )
+      if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, pitch ) )
         goto Exit;
 
       column = (FT_Byte*)bitmap->buffer;