diff --git a/asn1/m3ap/M3AP-IEs.asn b/asn1/m3ap/M3AP-IEs.asn
index edbe847a4b..2f3348e0bf 100644
--- a/asn1/m3ap/M3AP-IEs.asn
+++ b/asn1/m3ap/M3AP-IEs.asn
@@ -153,7 +153,8 @@ ExtendedMCE-ID ::= OCTET STRING (SIZE(1))
 Global-MCE-ID ::= SEQUENCE {
 	pLMN-Identity			PLMN-Identity,
 	mCE-ID					MCE-ID,
-	extendedMCE-ID			ExtendedMCE-ID,
+-- WS 3GPP Spec error fixed.
+	extendedMCE-ID			ExtendedMCE-ID OPTIONAL,
 	iE-Extensions			ProtocolExtensionContainer { {GlobalMCE-ID-ExtIEs} } OPTIONAL,
 	...
 }
diff --git a/epan/dissectors/packet-m3ap.c b/epan/dissectors/packet-m3ap.c
index ca11cd050f..e6f76b7382 100644
--- a/epan/dissectors/packet-m3ap.c
+++ b/epan/dissectors/packet-m3ap.c
@@ -899,7 +899,7 @@ dissect_m3ap_MCE_ID(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, pro
 static const per_sequence_t Global_MCE_ID_sequence[] = {
   { &hf_m3ap_pLMN_Identity  , ASN1_EXTENSION_ROOT    , ASN1_NOT_OPTIONAL, dissect_m3ap_PLMN_Identity },
   { &hf_m3ap_mCE_ID         , ASN1_EXTENSION_ROOT    , ASN1_NOT_OPTIONAL, dissect_m3ap_MCE_ID },
-  { &hf_m3ap_extendedMCE_ID , ASN1_EXTENSION_ROOT    , ASN1_NOT_OPTIONAL, dissect_m3ap_ExtendedMCE_ID },
+  { &hf_m3ap_extendedMCE_ID , ASN1_EXTENSION_ROOT    , ASN1_OPTIONAL    , dissect_m3ap_ExtendedMCE_ID },
   { &hf_m3ap_iE_Extensions  , ASN1_EXTENSION_ROOT    , ASN1_OPTIONAL    , dissect_m3ap_ProtocolExtensionContainer },
   { NULL, 0, 0, NULL }
 };