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-rw-r--r--xdiff-interface.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/xdiff-interface.c b/xdiff-interface.c
index bba236428a..61dc5c5470 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -152,8 +152,8 @@ int read_mmfile(mmfile_t *ptr, const char *filename)
if ((f = fopen(filename, "rb")) == NULL)
return error("Could not open %s", filename);
sz = xsize_t(st.st_size);
- ptr->ptr = xmalloc(sz);
- if (fread(ptr->ptr, sz, 1, f) != 1)
+ ptr->ptr = xmalloc(sz ? sz : 1);
+ if (sz && fread(ptr->ptr, sz, 1, f) != 1)
return error("Could not read %s", filename);
fclose(f);
ptr->size = sz;