diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index f8717f5..b398489 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -6778,7 +6778,7 @@
 			linenr_T    lnum = rex.reg_firstlnum + rex.lnum;
 			long_u	    vcol = 0;
 
-			if (lnum > 0
+			if (lnum >= 0
 				   && lnum <= wp->w_buffer->b_ml.ml_line_count)
 			    vcol = (long_u)win_linetabsize(wp, lnum,
 								rex.line, col);