diff --git a/llvm/lib/ObjectYAML/WasmYAML.cpp b/llvm/lib/ObjectYAML/WasmYAML.cpp
--- a/llvm/lib/ObjectYAML/WasmYAML.cpp
+++ b/llvm/lib/ObjectYAML/WasmYAML.cpp
@@ -614,6 +614,7 @@
 #define WASM_RELOC(name, value) IO.enumCase(Type, #name, wasm::name);
 #include "llvm/BinaryFormat/WasmRelocs.def"
 #undef WASM_RELOC
+  IO.enumFallback<Hex32>(Type);
 }
 
 } // end namespace yaml
diff --git a/llvm/test/ObjectYAML/wasm/event_section.yaml b/llvm/test/ObjectYAML/wasm/event_section.yaml
--- a/llvm/test/ObjectYAML/wasm/event_section.yaml
+++ b/llvm/test/ObjectYAML/wasm/event_section.yaml
@@ -27,6 +27,9 @@
       - Type:            R_WASM_EVENT_INDEX_LEB
         Index:           1
         Offset:          0x00000006
+      - Type:            10
+        Index:           1
+        Offset:          0x00000006
     Functions:
       - Index:           0
         Locals:
@@ -74,6 +77,9 @@
 # CHECK-NEXT:       - Type:            R_WASM_EVENT_INDEX_LEB
 # CHECK-NEXT:         Index:           1
 # CHECK-NEXT:         Offset:          0x6
+# CHECK-NEXT:       - Type:            R_WASM_EVENT_INDEX_LEB
+# CHECK-NEXT:         Index:           1
+# CHECK-NEXT:         Offset:          0x6
 # CHECK-NEXT:     Functions:
 # CHECK-NEXT:       - Index:           0
 # CHECK-NEXT:         Locals: