diff --git a/src/Edit.c b/src/Edit.c
index 5e334f7de..7fc826d05 100644
--- a/src/Edit.c
+++ b/src/Edit.c
@@ -2714,7 +2714,7 @@ void EditIndentBlock(HWND hwnd, int cmd, BOOL bFormatIndentation)
   //const DocPos iSelEnd = SciCall_GetSelectionEnd();
   const DocLn iCurLine = SciCall_LineFromPosition(iCurPos);
   const DocLn iAnchorLine = SciCall_LineFromPosition(iAnchorPos);
-  const BOOL bSingleLine = (iCurLine == iAnchorLine);
+  const BOOL bSingleLine = IsSingleLineSelection();
 
   const int _bTabIndents = (int)SendMessage(hwnd, SCI_GETTABINDENTS, 0, 0);
   const int _bBSpUnindents = (int)SendMessage(hwnd, SCI_GETBACKSPACEUNINDENTS, 0, 0);
diff --git a/src/SciCall.h b/src/SciCall.h
index 448cec996..70fc0f5b8 100644
--- a/src/SciCall.h
+++ b/src/SciCall.h
@@ -228,11 +228,10 @@ DeclareSciCallV1(SetTechnology, SETTECHNOLOGY, int, technology);
 //
 //  Utilities
 //
-
-#define IsSelThinRectangle() (SciCall_GetSelectionMode() == SC_SEL_THIN)
-
 #define SciClearClipboard() SciCall_CopyText(0, "")
 
+#define IsSelThinRectangle() (SciCall_GetSelectionMode() == SC_SEL_THIN)
+#define IsFullLineSelected() (SciCall_GetSelectionMode() == SC_SEL_LINES)
 #define IsSingleLineSelection() \
 (SciCall_LineFromPosition(SciCall_GetCurrentPos()) == SciCall_LineFromPosition(SciCall_GetAnchor()))