diff --git a/src/bej_decoder_json.cpp b/src/bej_decoder_json.cpp
index 5f8ddac..9fceeba 100644
--- a/src/bej_decoder_json.cpp
+++ b/src/bej_decoder_json.cpp
@@ -202,6 +202,12 @@
     struct BejJsonParam* params =
         reinterpret_cast<struct BejJsonParam*>(dataPtr);
 
+    // Sanity check for zeroCount
+    if (value->zeroCount > 100)
+    {
+        return bejErrorInvalidSize;
+    }
+
     addPropertyNameToOutput(params, propertyName);
     params->output->append(std::to_string(value->whole));
     params->output->push_back('.');