diff --git a/ios/Text/RNSVGTSpan.m b/ios/Text/RNSVGTSpan.m
index 5d8e5364..16b94c40 100644
--- a/ios/Text/RNSVGTSpan.m
+++ b/ios/Text/RNSVGTSpan.m
@@ -273,6 +273,10 @@ TopAlignedLabel *label;
     CGRect textBounds = CTLineGetBoundsWithOptions(line, 0);
     CGFloat textMeasure = CGRectGetWidth(textBounds);
     cachedAdvance = textMeasure;
+
+    CFRelease(attrString);
+    CFRelease(line);
+
     return textMeasure;
 }