diff --git a/library/debug.c b/library/debug.c
index 687e194..81ee649 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -147,9 +147,9 @@
         if( ( ( X->p[n] >> j ) & 1 ) != 0 )
             break;
 
-    snprintf( str, maxlen, "%s(%04d): value of '%s' (%lu bits) is:\n",
+    snprintf( str, maxlen, "%s(%04d): value of '%s' (%d bits) is:\n",
               file, line, text, 
-              (unsigned long) ( ( n * ( sizeof(t_uint) << 3 ) ) + j + 1 ) );
+              (int) ( ( n * ( sizeof(t_uint) << 3 ) ) + j + 1 ) );
 
     str[maxlen] = '\0';
     ssl->f_dbg( ssl->p_dbg, level, str );