diff --git a/tests/test_bigints_vs_gmp.nim b/tests/test_bigints_vs_gmp.nim
index 4015c47..0852b03 100644
--- a/tests/test_bigints_vs_gmp.nim
+++ b/tests/test_bigints_vs_gmp.nim
@@ -88,7 +88,7 @@ proc main() =
   mpz_init(r)
 
   testRandomModSizes(100, aBits, mBits):
-    echo "Testing: Dividend bitsize " & align($aBits, 4) & " -- modulus bitsize " & align($mBits, 4)
+    stdout.write "Testing: Dividend bitsize " & align($aBits, 4) & " -- modulus bitsize " & align($mBits, 4)
 
     # Generate random value in the range 0 ..< 2^aBits
     mpz_urandomb(a, gmpRng, aBits)
@@ -96,6 +96,8 @@ proc main() =
     mpz_urandomb(m, gmpRng, mBits)
     mpz_setbit(m, mBits-1)
 
+    discard gmp_printf(" -- %#Zx mod %#Zx\n", a.addr, m.addr)
+
     #########################################################
     # Conversion buffers
     const aLen = (aBits + 7) div 8