6 files changed, 12 insertions, 0 deletions
diff --git a/tests/regression/issue_118/enumdef.proto b/tests/regression/issue_118/enumdef.proto
index 830d2988..46845bc9 100644
--- a/tests/regression/issue_118/enumdef.proto
+++ b/tests/regression/issue_118/enumdef.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import 'nanopb.proto';
 
 enum MyEnum {
diff --git a/tests/regression/issue_118/enumuse.proto b/tests/regression/issue_118/enumuse.proto
index d778fb8f..4afc4521 100644
--- a/tests/regression/issue_118/enumuse.proto
+++ b/tests/regression/issue_118/enumuse.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import 'enumdef.proto';
 
 message MyMessage {
diff --git a/tests/regression/issue_125/extensionbug.proto b/tests/regression/issue_125/extensionbug.proto
index c4ac6860..fd1e74f1 100644
--- a/tests/regression/issue_125/extensionbug.proto
+++ b/tests/regression/issue_125/extensionbug.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message Message1
 {
 	optional uint32	fieldA = 1;
diff --git a/tests/regression/issue_141/testproto.proto b/tests/regression/issue_141/testproto.proto
index 21598b45..a445c68a 100644
--- a/tests/regression/issue_141/testproto.proto
+++ b/tests/regression/issue_141/testproto.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import 'nanopb.proto';
 
 message SubMessage
diff --git a/tests/regression/issue_145/comments.proto b/tests/regression/issue_145/comments.proto
index 4e86b302..621779f5 100644
--- a/tests/regression/issue_145/comments.proto
+++ b/tests/regression/issue_145/comments.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message DummyMessage {
     required string foo = 1;
     required string bar = 2;
diff --git a/tests/regression/issue_166/enums.proto b/tests/regression/issue_166/enums.proto
index a0964ab4..36948044 100644
--- a/tests/regression/issue_166/enums.proto
+++ b/tests/regression/issue_166/enums.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 enum SignedEnum {
     SE_MIN = -1;
     SE_MAX = 255;