diff --git a/src/SldStyleParser.ts b/src/SldStyleParser.ts
index 005c2957..0b238896 100644
--- a/src/SldStyleParser.ts
+++ b/src/SldStyleParser.ts
@@ -812,7 +812,10 @@ export class SldStyleParser implements StyleParser<string> {
     }
 
     textSymbolizer.color = color ? color : '#000000';
-    textSymbolizer.opacity = isNil(opacity) ? 1 : numberExpression(opacity);
+
+    if (!isNil(opacity)) {
+      textSymbolizer.opacity = numberExpression(opacity);
+    }
 
     const haloRadius = get(sldSymbolizer, 'Halo.Radius.#text');
     if (!isNil(haloRadius)) {