diff --git a/src/ex_getln.c b/src/ex_getln.c
index 7411732..7659a37 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -5202,7 +5202,7 @@
 		    for (i = 0; i < num_p; ++i)
 		    {
 			((char_u **)ga->ga_data)[ga->ga_len] =
-					    vim_strnsave(p[i], STRLEN(p[i]));
+					vim_strnsave(p[i], (int)STRLEN(p[i]));
 			++ga->ga_len;
 		    }
 		}