diff --git a/XML/src/xmlparse.cpp b/XML/src/xmlparse.cpp
index 72f563d74..967659394 100644
--- a/XML/src/xmlparse.cpp
+++ b/XML/src/xmlparse.cpp
@@ -917,6 +917,7 @@ gather_time_entropy(void)
 
 static unsigned long
 ENTROPY_DEBUG(const char * label, unsigned long entropy) {
+#ifdef ENABLE_EXPAT_ENTROPY_DEBUG
   const char * const EXPAT_ENTROPY_DEBUG = getenv("EXPAT_ENTROPY_DEBUG");
   if (EXPAT_ENTROPY_DEBUG && ! strcmp(EXPAT_ENTROPY_DEBUG, "1")) {
     fprintf(stderr, "Entropy: %s --> 0x%0*lx (%lu bytes)\n",
@@ -924,6 +925,7 @@ ENTROPY_DEBUG(const char * label, unsigned long entropy) {
         (int)sizeof(entropy) * 2, entropy,
         (unsigned long)sizeof(entropy));
   }
+#endif
   return entropy;
 }