diff --git a/src/include/lwip/snmp_asn1.h b/src/include/lwip/snmp_asn1.h
index 3d70d330..8a602881 100644
--- a/src/include/lwip/snmp_asn1.h
+++ b/src/include/lwip/snmp_asn1.h
@@ -40,6 +40,8 @@
 #include "lwip/pbuf.h"
 #include "lwip/snmp.h"
 
+#if LWIP_SNMP
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -94,4 +96,6 @@ err_t snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u8_t raw_len, u8_t *raw);
 }
 #endif
 
+#endif /* LWIP_SNMP */
+
 #endif /* __LWIP_SNMP_ASN1_H__ */
diff --git a/src/include/lwip/snmp_msg.h b/src/include/lwip/snmp_msg.h
index d2028255..b2f69c4b 100644
--- a/src/include/lwip/snmp_msg.h
+++ b/src/include/lwip/snmp_msg.h
@@ -39,6 +39,8 @@
 #include "lwip/snmp.h"
 #include "lwip/snmp_structs.h"
 
+#if LWIP_SNMP
+
 #if SNMP_PRIVATE_MIB
 #include "private_mib.h"
 #endif
@@ -304,4 +306,6 @@ void snmp_authfail_trap(void);
 }
 #endif
 
+#endif /* LWIP_SNMP */
+
 #endif /* __LWIP_SNMP_MSG_H__ */