diff --git a/ChangeLog b/ChangeLog
index 3e6bae715..f43a7ef63 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-02-16  Wink Saville  <wink@saville.com>
+
+	* src/autofit/afwarp.h (af_warper_compute): Fix declaration.
+
 2019-02-02  Nikolaus Waxweiler  <madigens@gmail.com>
 
 	[truetype] Apply MVAR hasc, hdsc and hlgp metrics to current FT_Face metrics.
diff --git a/src/autofit/afwarp.h b/src/autofit/afwarp.h
index 5b689ee7a..cde71ff7e 100644
--- a/src/autofit/afwarp.h
+++ b/src/autofit/afwarp.h
@@ -53,7 +53,7 @@ FT_BEGIN_HEADER
                      AF_GlyphHints  hints,
                      AF_Dimension   dim,
                      FT_Fixed      *a_scale,
-                     FT_Fixed      *a_delta );
+                     FT_Pos        *a_delta );
 #endif