diff --git a/src/idl_gen_cpp.cpp b/src/idl_gen_cpp.cpp
index 1aeff87d6..ba07194cd 100644
--- a/src/idl_gen_cpp.cpp
+++ b/src/idl_gen_cpp.cpp
@@ -165,7 +165,7 @@ static void GenEnum(EnumDef &enum_def, std::string *code_ptr,
     // verifier function to call, this should be safe even if the union type
     // has been corrupted, since the verifiers will simply fail when called
     // on the wrong type.
-    auto signature = "bool Verify" + enum_def.name +
+    auto signature = "inline bool Verify" + enum_def.name +
                      "(flatbuffers::Verifier &verifier, " +
                      "const void *union_obj, uint8_t type)";
     code += signature + ";\n\n";
diff --git a/tests/monster_test_generated.h b/tests/monster_test_generated.h
index 8c45a40b7..a3e138b8c 100755
--- a/tests/monster_test_generated.h
+++ b/tests/monster_test_generated.h
@@ -43,7 +43,7 @@ inline const char **EnumNamesAny() {
 
 inline const char *EnumNameAny(int e) { return EnumNamesAny()[e]; }
 
-bool VerifyAny(flatbuffers::Verifier &verifier, const void *union_obj, uint8_t type);
+inline bool VerifyAny(flatbuffers::Verifier &verifier, const void *union_obj, uint8_t type);
 
 MANUALLY_ALIGNED_STRUCT(2) Test {
  private:
@@ -188,7 +188,7 @@ inline flatbuffers::Offset<Monster> CreateMonster(flatbuffers::FlatBufferBuilder
   return builder_.Finish();
 }
 
-bool VerifyAny(flatbuffers::Verifier &verifier, const void *union_obj, uint8_t type) {
+inline bool VerifyAny(flatbuffers::Verifier &verifier, const void *union_obj, uint8_t type) {
   switch (type) {
     case Any_NONE: return true;
     case Any_Monster: return verifier.VerifyTable(reinterpret_cast<const Monster *>(union_obj));