diff --git a/dlls/comctl32/listview.c b/dlls/comctl32/listview.c
index 4d2edd0c44d..24b90bc8c26 100644
--- a/dlls/comctl32/listview.c
+++ b/dlls/comctl32/listview.c
@@ -6205,8 +6205,13 @@ static HIMAGELIST LISTVIEW_GetImageList(const LISTVIEW_INFO *infoPtr, INT nImage
     switch (nImageList)
     {
     case LVSIL_NORMAL: return infoPtr->himlNormal;
-    case LVSIL_SMALL: return infoPtr->himlSmall;
-    case LVSIL_STATE: return infoPtr->himlState;
+    case LVSIL_SMALL:  return infoPtr->himlSmall;
+    case LVSIL_STATE:  return infoPtr->himlState;
+    case LVSIL_GROUPHEADER:
+        FIXME("LVSIL_GROUPHEADER not supported\n");
+        break;
+    default:
+        WARN("got unknown imagelist index - %d\n", nImageList);
     }
     return NULL;
 }
diff --git a/include/commctrl.h b/include/commctrl.h
index 23a296b30c0..43609255451 100644
--- a/include/commctrl.h
+++ b/include/commctrl.h
@@ -3015,6 +3015,7 @@ static const WCHAR WC_LISTVIEWW[] = { 'S','y','s',
 #define LVSIL_NORMAL            0
 #define LVSIL_SMALL             1
 #define LVSIL_STATE             2
+#define LVSIL_GROUPHEADER       3
 
 /* following 2 flags only for LVS_OWNERDATA listviews */
 /* and only in report or list mode */