diff --git a/mdl/generate.ts b/mdl/generate.ts
index fb0f0d8..8da483e 100644
--- a/mdl/generate.ts
+++ b/mdl/generate.ts
@@ -773,7 +773,7 @@ function generateRibbonEmitterChunk (ribbonEmitter: RibbonEmitter): string {
         generateIntPropIfNotEmpty('Gravity', ribbonEmitter.Gravity, 0) +
         generateIntProp('Rows', ribbonEmitter.Rows) +
         generateIntProp('Columns', ribbonEmitter.Columns) +
-        generateIntPropIfNotEmpty('MaterialID', ribbonEmitter.MaterialID, undefined) +
+        generateIntProp('MaterialID', ribbonEmitter.MaterialID) +
         generateBlockEnd();
 }
 
diff --git a/package.json b/package.json
index 3d721ce..d96c44f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "war3-model",
-  "version": "3.1.1",
+  "version": "3.1.2",
   "description": "Warcraft 3 model parser, generator, convertor and previewer",
   "keywords": [
     "warcraft3",