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-rw-r--r--src/diff.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/diff.c b/src/diff.c
index 69ba7a3893..02f1c33256 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -712,7 +712,7 @@ diff_write_buffer(buf_T *buf, diffin_T *din)
// xdiff requires one big block of memory with all the text.
for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum)
- len += STRLEN(ml_get_buf(buf, lnum, FALSE)) + 1;
+ len += (long)STRLEN(ml_get_buf(buf, lnum, FALSE)) + 1;
ptr = lalloc(len, TRUE);
if (ptr == NULL)
{