diff --git a/libImaging/Imaging.h b/libImaging/Imaging.h
index aa4009889..ab8f50c12 100644
--- a/libImaging/Imaging.h
+++ b/libImaging/Imaging.h
@@ -168,9 +168,9 @@ extern Imaging ImagingNewMap(const char* filename, int readonly,
                              const char* mode, int xsize, int ysize);
 
 extern Imaging ImagingNewPrologue(const char *mode,
-                                  unsigned xsize, unsigned ysize);
+                                  int xsize, int ysize);
 extern Imaging ImagingNewPrologueSubtype(const char *mode,
-                                  unsigned xsize, unsigned ysize,
+                                  int xsize, int ysize,
                                   int structure_size);
 extern Imaging ImagingNewEpilogue(Imaging im);
 
diff --git a/libImaging/Storage.c b/libImaging/Storage.c
index 5968ad7a1..04d6dd230 100644
--- a/libImaging/Storage.c
+++ b/libImaging/Storage.c
@@ -46,7 +46,7 @@ int ImagingNewCount = 0;
  */
 
 Imaging
-ImagingNewPrologueSubtype(const char *mode, unsigned xsize, unsigned ysize,
+ImagingNewPrologueSubtype(const char *mode, int xsize, int ysize,
                           int size)
 {
     Imaging im;
@@ -226,7 +226,7 @@ ImagingNewPrologueSubtype(const char *mode, unsigned xsize, unsigned ysize,
 }
 
 Imaging
-ImagingNewPrologue(const char *mode, unsigned xsize, unsigned ysize)
+ImagingNewPrologue(const char *mode, int xsize, int ysize)
 {
     return ImagingNewPrologueSubtype(
         mode, xsize, ysize, sizeof(struct ImagingMemoryInstance)