diff --git a/src/_imagingcms.c b/src/_imagingcms.c
index 63d78f84d..4b0e21d7a 100644
--- a/src/_imagingcms.c
+++ b/src/_imagingcms.c
@@ -622,7 +622,7 @@ cms_profile_is_intent_supported(CmsProfileObject *self, PyObject *args) {
 static PyObject *
 cms_get_display_profile_win32(PyObject *self, PyObject *args) {
     char filename[MAX_PATH];
-    cmsUInt32Number filename_size;
+    DWORD filename_size;
     BOOL ok;
 
     HANDLE handle = 0;
diff --git a/src/display.c b/src/display.c
index 6b66ddafb..abf94f1e1 100644
--- a/src/display.c
+++ b/src/display.c
@@ -716,7 +716,7 @@ PyImaging_DrawWmf(PyObject *self, PyObject *args) {
     HDC dc;
     RECT rect;
     PyObject *buffer = NULL;
-    char *ptr;
+    void *ptr;
 
     char *data;
     Py_ssize_t datasize;
diff --git a/src/libImaging/Dib.c b/src/libImaging/Dib.c
index 1b5bfe132..5194bfca3 100644
--- a/src/libImaging/Dib.c
+++ b/src/libImaging/Dib.c
@@ -95,7 +95,7 @@ ImagingNewDIB(const char *mode, int xsize, int ysize) {
     }
 
     dib->bitmap =
-        CreateDIBSection(dib->dc, dib->info, DIB_RGB_COLORS, &dib->bits, NULL, 0);
+        CreateDIBSection(dib->dc, dib->info, DIB_RGB_COLORS, (void **)&dib->bits, NULL, 0);
     if (!dib->bitmap) {
         free(dib->info);
         free(dib);
diff --git a/src/libImaging/TiffDecode.c b/src/libImaging/TiffDecode.c
index e3b81590e..4874dd26a 100644
--- a/src/libImaging/TiffDecode.c
+++ b/src/libImaging/TiffDecode.c
@@ -973,7 +973,7 @@ ImagingLibTiffEncode(Imaging im, ImagingCodecState state, UINT8 *buffer, int byt
     }
 
     if (state->state == 1 && !clientstate->fp) {
-        int read = (int)_tiffReadProc(clientstate, (tdata_t)buffer, (tsize_t)bytes);
+        int read = (int)_tiffReadProc((thandle_t)clientstate, (tdata_t)buffer, (tsize_t)bytes);
         TRACE(
             ("Buffer: %p: %c%c%c%c\n",
              buffer,