diff --git a/lib/cocoa/src/protocol/TBinaryProtocol.m b/lib/cocoa/src/protocol/TBinaryProtocol.m
index ba7f462..5999e25 100644
--- a/lib/cocoa/src/protocol/TBinaryProtocol.m
+++ b/lib/cocoa/src/protocol/TBinaryProtocol.m
@@ -90,10 +90,18 @@
 
 - (NSString *) readStringBody: (int) size
 {
-  char buff[size+1];
-  [mTransport readAll: (uint8_t *) buff offset: 0 length: size];
-  buff[size] = 0;
-  return [NSString stringWithUTF8String: buff];
+  char * buffer = malloc(size+1);
+  if (!buffer) {
+    @throw [TProtocolException exceptionWithName: @"TProtocolException"
+                                          reason: [NSString stringWithFormat: @"Unable to allocate memory in %s, size: %i",
+                                                   __PRETTY_FUNCTION__,
+                                                   size]];;
+  }
+  [mTransport readAll: (uint8_t *) buffer offset: 0 length: size];
+  buffer[size] = 0;
+  NSString * result = [NSString stringWithUTF8String: buffer];
+  free(buffer);
+  return result;
 }