diff --git a/lib/extract/extractViewBox.js b/lib/extract/extractViewBox.js
index b718277a..e2379bb6 100644
--- a/lib/extract/extractViewBox.js
+++ b/lib/extract/extractViewBox.js
@@ -34,7 +34,7 @@ export default function(props) {
         .split(spacesRegExp)
         .map(Number);
 
-    if (params.length === 4 && params.some(isNaN)) {
+    if (params.length !== 4 || params.some(isNaN)) {
         console.warn("Invalid `viewBox` prop:" + viewBox);
         return null;
     }