diff --git a/dtool/src/prc/encryptStreamBuf.cxx b/dtool/src/prc/encryptStreamBuf.cxx
index fe562e59e6..a8e7c04967 100644
--- a/dtool/src/prc/encryptStreamBuf.cxx
+++ b/dtool/src/prc/encryptStreamBuf.cxx
@@ -95,6 +95,10 @@ EncryptStreamBuf::
 ~EncryptStreamBuf() {
   close_read();
   close_write();
+
+#ifdef PHAVE_IOSTREAM
+  delete[] eback();
+#endif
 }
 
 /**