diff --git a/reactos/lib/crt/misc/environ.c b/reactos/lib/crt/misc/environ.c
index 02f83455769..50254a9f307 100644
--- a/reactos/lib/crt/misc/environ.c
+++ b/reactos/lib/crt/misc/environ.c
@@ -220,8 +220,11 @@ int SetEnv(const wchar_t *option)
    char *mboption;
    int remove, index, count, size, result = 0, found = 0;
 
-   if (option == NULL || (epos = wcschr(option, L'=')) == NULL)
-      return -1;
+   if (option == NULL || 
+       ((epos = wcschr(option, L'=')) == NULL) ||
+       (epos == option)) 
+     return -1;
+
    remove = (epos[1] == 0);
 
    /* Duplicate environment if needed. */