diff --git a/dlls/gphoto2.ds/capability.c b/dlls/gphoto2.ds/capability.c
index 754e58dd6a8..378ef2a0358 100644
--- a/dlls/gphoto2.ds/capability.c
+++ b/dlls/gphoto2.ds/capability.c
@@ -195,7 +195,7 @@ static TW_BOOL GPHOTO2_OneValueSet32 (pTW_CAPABILITY pCapability, TW_UINT32 valu
 {
     pCapability->hContainer = GlobalAlloc (0, sizeof(TW_ONEVALUE));
 
-    TRACE("-> %ld\n", value);
+    TRACE("-> %d\n", value);
 
     if (pCapability->hContainer)
     {
@@ -258,7 +258,7 @@ static TW_BOOL GPHOTO2_EnumGet16 (pTW_CAPABILITY pCapability, int *nrofvalues, T
     *nrofvalues = pVal->NumItems;
     *values = HeapAlloc( GetProcessHeap(), 0, sizeof(TW_UINT16)*pVal->NumItems);
     memcpy (*values, pVal->ItemList, sizeof(TW_UINT16)*(*nrofvalues));
-    FIXME("Current Index %ld, Default Index %ld\n", pVal->CurrentIndex, pVal->DefaultIndex);
+    FIXME("Current Index %d, Default Index %d\n", pVal->CurrentIndex, pVal->DefaultIndex);
     GlobalUnlock (pCapability->hContainer);
     return TRUE;
 }
@@ -310,7 +310,7 @@ static TW_UINT16 GPHOTO2_ICAPXferMech (pTW_CAPABILITY pCapability, TW_UINT16 act
                 if (!GPHOTO2_OneValueGet32 (pCapability, &xfermechtemp))
                     return TWCC_LOWMEMORY;
 		activeDS.capXferMech = xfermechtemp;
-		TRACE("xfermech is %ld\n", xfermechtemp);
+                TRACE("xfermech is %d\n", xfermechtemp);
 		return TWCC_SUCCESS;
             }
             else if (pCapability->ConType == TWON_ENUMERATION)
diff --git a/dlls/gphoto2.ds/gphoto2_main.c b/dlls/gphoto2.ds/gphoto2_main.c
index 8cf1f9dadf6..311abb84a15 100644
--- a/dlls/gphoto2.ds/gphoto2_main.c
+++ b/dlls/gphoto2.ds/gphoto2_main.c
@@ -343,7 +343,7 @@ static TW_UINT16 GPHOTO2_PendingXfersEndXfer (pTW_IDENTITY pOrigin,
 	if (file->download)
 	    count++;
     }
-    TRACE("count = %ld\n", count);
+    TRACE("count = %d\n", count);
     pPendingXfers->Count = count;
     if (pPendingXfers->Count != 0) {
         activeDS.currentState = 6;
@@ -379,7 +379,7 @@ static TW_UINT16 GPHOTO2_PendingXfersGet (pTW_IDENTITY pOrigin,
 	if (file->download)
 	    count++;
     }
-    TRACE("count = %ld\n", count);
+    TRACE("count = %d\n", count);
     pPendingXfers->Count = count;
     activeDS.twCC = TWCC_SUCCESS;
     return TWRC_SUCCESS;
@@ -1002,7 +1002,7 @@ DS_Entry ( pTW_IDENTITY pOrigin,
 {
     TW_UINT16 twRC = TWRC_SUCCESS;  /* Return Code */
 
-    TRACE("(DG=%ld DAT=%d MSG=%d)\n", DG, DAT, MSG);
+    TRACE("(DG=%d DAT=%d MSG=%d)\n", DG, DAT, MSG);
 
     switch (DG)
     {
diff --git a/dlls/sane.ds/sane_main.c b/dlls/sane.ds/sane_main.c
index ea1af0ea15e..468df3b55fd 100644
--- a/dlls/sane.ds/sane_main.c
+++ b/dlls/sane.ds/sane_main.c
@@ -543,7 +543,7 @@ DS_Entry ( pTW_IDENTITY pOrigin,
 {
     TW_UINT16 twRC = TWRC_SUCCESS;  /* Return Code */
 
-    TRACE("(DG=%ld DAT=%d MSG=%d)\n", DG, DAT, MSG);
+    TRACE("(DG=%d DAT=%d MSG=%d)\n", DG, DAT, MSG);
 
     switch (DG)
     {
diff --git a/dlls/twain_32/twain32_main.c b/dlls/twain_32/twain32_main.c
index 3239ec57e68..9eb27547f14 100644
--- a/dlls/twain_32/twain32_main.c
+++ b/dlls/twain_32/twain32_main.c
@@ -159,7 +159,7 @@ DSM_Entry (pTW_IDENTITY pOrigin,
 {
     TW_UINT16 twRC = TWRC_SUCCESS;  /* Return Code */
 
-    TRACE("(DG=%ld DAT=%d MSG=%d)\n", DG, DAT, MSG);
+    TRACE("(DG=%d DAT=%d MSG=%d)\n", DG, DAT, MSG);
 
     if (pDest)
     {
@@ -172,7 +172,7 @@ DSM_Entry (pTW_IDENTITY pOrigin,
 	    return TWRC_FAILURE;
 	}
 	DSM_twCC = TWCC_SUCCESS;
-	TRACE("Forwarding %ld/%d/%d/%p to DS.\n", DG, DAT, MSG, pData);
+        TRACE("Forwarding %d/%d/%d/%p to DS.\n", DG, DAT, MSG, pData);
 	twRC = pSource->dsEntry(pOrigin, DG, DAT, MSG, pData);
 	TRACE("return value is %d\n", twRC);
 	return twRC;
@@ -183,7 +183,7 @@ DSM_Entry (pTW_IDENTITY pOrigin,
             twRC = TWAIN_SourceManagerHandler (pOrigin, DAT, MSG, pData);
             break;
         default:
-	    FIXME("The DSM does not handle DG %ld\n", DG);
+            FIXME("The DSM does not handle DG %d\n", DG);
             DSM_twCC = TWCC_BADPROTOCOL;
             twRC = TWRC_FAILURE;
     }
diff --git a/include/twain.h b/include/twain.h
index 13bc406b271..a7ff0f092af 100644
--- a/include/twain.h
+++ b/include/twain.h
@@ -127,10 +127,10 @@ typedef char    TW_STR255[256],   FAR *pTW_STR255;
 /* Numeric types. */
 typedef char           TW_INT8,   FAR *pTW_INT8;
 typedef short          TW_INT16,  FAR *pTW_INT16;
-typedef long           TW_INT32,  FAR *pTW_INT32;
+typedef LONG           TW_INT32,  FAR *pTW_INT32;
 typedef unsigned char  TW_UINT8,  FAR *pTW_UINT8;
 typedef unsigned short TW_UINT16, FAR *pTW_UINT16;
-typedef unsigned long  TW_UINT32, FAR *pTW_UINT32;
+typedef ULONG          TW_UINT32, FAR *pTW_UINT32;
 typedef unsigned short TW_BOOL,   FAR *pTW_BOOL;
 
 /* Fixed point structure type. */