diff --git a/src/libs/zbxcfg/cfg.c b/src/libs/zbxcfg/cfg.c
index faa8d1b080f..5623e5ae046 100644
--- a/src/libs/zbxcfg/cfg.c
+++ b/src/libs/zbxcfg/cfg.c
@@ -473,6 +473,10 @@ static int	__parse_cfg_file(const char *cfg_file, zbx_cfg_line_t *cfg, int level
 			if (NULL == (value = strchr(line, '=')))
 				goto non_key_value;
 
+			/* disallow '==' */
+			if (value[1] == '=')
+				goto non_key_value;
+
 			*value++ = '\0';
 
 			zbx_rtrim(parameter, ZBX_CFG_RTRIM_CHARS);