diff --git a/calcpy/tests/test_transformers.py b/calcpy/tests/test_transformers.py
index e470323..dd062ca 100644
--- a/calcpy/tests/test_transformers.py
+++ b/calcpy/tests/test_transformers.py
@@ -1,7 +1,7 @@
 from sympy import symbols, I
 from datetime import datetime
 
-def test_autodate(ip):
+def test_auto_date(ip):
     dt = ip.run_cell('d"today"-d"yesterday"').result
     assert dt.days == 1 or 24*60*60-1 <= dt.seconds <= 24*60*60
     assert ip.run_cell('d\'1 January 1970\'').result == datetime(1970, 1, 1)
@@ -26,6 +26,10 @@ def test_auto_product(ip):
     assert ip.run_cell('f\'{1.1:1.2f}\'').result == '1.10'
     assert ip.run_cell('\'%1.2f\' % 1.234').result == '1.23'
 
+    # check no false positives:
+    assert ip.run_cell('0b1010').result == 0b1010
+    assert ip.run_cell('0x10f').result == 0x10f
+
 def test_unicode_pow(ip):
     x = ip.run_cell('x').result
     assert ip.run_cell('x⁻¹³⁴').result == x**-134
diff --git a/calcpy/transformers.py b/calcpy/transformers.py
index 5e968fb..9064103 100644
--- a/calcpy/transformers.py
+++ b/calcpy/transformers.py
@@ -121,14 +121,14 @@ def auto_prod_replace(match):
         return match[0]
 
     if ip.calcpy.auto_product:
-        # number - hex number | engineering number | number
-        num_pat = r'0x[0-9a-f]*|0X[0-9A-F]*|\d*\.?\d+e-?\d+|\d*\.?\d+'
+        # number - binary | hex | engineering number | number
+        num_pat = r'0[bB][01]*|0[xX][0-9a-fA-F]*|\d*\.?\d+e-?\d+|\d*\.?\d+'
         # prod - (format spec|middle of name detection)?(number)(var name)?
         prod_pat = rf'(: *|[^\d\W])?({num_pat})({var_pat})?'
         code = re.sub(prod_pat, auto_prod_replace, code)
 
-        # pattern is (right parentheses)(hex number | engineering number | number | var name)
-        prod_pat = rf'(\))(0x[0-9a-f]*|0X[0-9A-F]*|\d*\.?\d+e-?\d+|\d*\.?\d+|{var_pat})'
+        # pattern is (right parentheses)(binary | hex | engineering number | number | var name)
+        prod_pat = rf'(\))(0[bB][01]*|0[xX][0-9a-fA-F]*|\d*\.?\d+e-?\d+|\d*\.?\d+|{var_pat})'
         code = re.sub(prod_pat, r'\1*\2', code)
 
     for key, val in latex_matches.items():