diff --git a/dlls/shell32/shfldr_mycomp.c b/dlls/shell32/shfldr_mycomp.c
index b5b9ff22aed..60f32f1f233 100644
--- a/dlls/shell32/shfldr_mycomp.c
+++ b/dlls/shell32/shfldr_mycomp.c
@@ -87,8 +87,6 @@ static const shvheader mycomputer_header[] =
     { NULL, 0, IDS_SHV_COLUMN7, SHCOLSTATE_TYPE_STR | SHCOLSTATE_ONBYDEFAULT, LVCFMT_RIGHT, 10 },
 };
 
-#define MYCOMPUTERSHELLVIEWCOLUMNS sizeof(mycomputer_header)/sizeof(shvheader)
-
 /**************************************************************************
 *    ISF_MyComputer_Constructor
 */
@@ -799,7 +797,7 @@ static HRESULT WINAPI ISF_MyComputer_fnGetDefaultColumnState (
 
     TRACE ("(%p)->(%d %p)\n", This, iColumn, pcsFlags);
 
-    if (!pcsFlags || iColumn >= MYCOMPUTERSHELLVIEWCOLUMNS)
+    if (!pcsFlags || iColumn >= ARRAY_SIZE(mycomputer_header))
         return E_INVALIDARG;
 
     *pcsFlags = mycomputer_header[iColumn].pcsFlags;
@@ -826,7 +824,7 @@ static HRESULT WINAPI ISF_MyComputer_fnGetDetailsOf (IShellFolder2 *iface,
 
     TRACE ("(%p)->(%p %i %p)\n", This, pidl, iColumn, psd);
 
-    if (!psd || iColumn >= MYCOMPUTERSHELLVIEWCOLUMNS)
+    if (!psd || iColumn >= ARRAY_SIZE(mycomputer_header))
         return E_INVALIDARG;
 
     if (!pidl)
@@ -871,7 +869,7 @@ static HRESULT WINAPI ISF_MyComputer_fnMapColumnToSCID (IShellFolder2 *iface, UI
 
     TRACE("(%p)->(%u %p)\n", This, column, scid);
 
-    if (column >= MYCOMPUTERSHELLVIEWCOLUMNS)
+    if (column >= ARRAY_SIZE(mycomputer_header))
         return E_INVALIDARG;
 
     return shellfolder_map_column_to_scid(mycomputer_header, column, scid);
diff --git a/dlls/shell32/shfldr_printers.c b/dlls/shell32/shfldr_printers.c
index 66260ac8161..8e25e58857b 100644
--- a/dlls/shell32/shfldr_printers.c
+++ b/dlls/shell32/shfldr_printers.c
@@ -63,8 +63,6 @@ static const shvheader printers_header[] = {
     { NULL, 0, IDS_SHV_COL_MODEL, SHCOLSTATE_TYPE_STR | SHCOLSTATE_ONBYDEFAULT, LVCFMT_LEFT, 20 }
 };
 
-#define PRINTERS_FOLDER_COL_NUM sizeof(printers_header)/sizeof(shvheader)
-
 static HRESULT WINAPI IShellFolder_Printers_fnQueryInterface(IShellFolder2 *iface,
                REFIID riid, LPVOID *ppvObj)
 {
@@ -283,7 +281,7 @@ static HRESULT WINAPI IShellFolder_Printers_fnGetDefaultColumnState (
 
     TRACE("(%p)->(%d %p)\n", This, iColumn, pcsFlags);
 
-    if (iColumn >= PRINTERS_FOLDER_COL_NUM)
+    if (iColumn >= ARRAY_SIZE(printers_header))
         return E_INVALIDARG;
 
     *pcsFlags = printers_header[iColumn].pcsFlags;
@@ -306,7 +304,7 @@ static HRESULT WINAPI IShellFolder_Printers_fnGetDetailsOf (IShellFolder2 *iface
 
     TRACE("(%p)->(%p %i %p)\n", This, pidl, iColumn, psd);
 
-    if (iColumn >= PRINTERS_FOLDER_COL_NUM)
+    if (iColumn >= ARRAY_SIZE(printers_header))
         return E_NOTIMPL;
 
     if (!pidl)
@@ -323,7 +321,7 @@ static HRESULT WINAPI IShellFolder_Printers_fnMapColumnToSCID (IShellFolder2 *if
 
     TRACE("(%p)->(%u %p)\n", This, column, scid);
 
-    if (column >= PRINTERS_FOLDER_COL_NUM)
+    if (column >= ARRAY_SIZE(printers_header))
         return E_INVALIDARG;
 
     return shellfolder_map_column_to_scid(printers_header, column, scid);