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-rw-r--r--src/evalvars.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/evalvars.c b/src/evalvars.c
index 066543669b..b2343c0a2b 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -3960,7 +3960,7 @@ set_var_const(
|| STRNCMP(name, "g:", 2) == 0 || var_in_autoload))
goto failed;
- di = alloc(sizeof(dictitem_T) + STRLEN(varname));
+ di = alloc(offsetof(dictitem_T, di_key) + STRLEN(varname) + 1);
if (di == NULL)
goto failed;
STRCPY(di->di_key, varname);