diff --git a/src/bootstrap/configure.py b/src/bootstrap/configure.py
index ddb894eb1f659..d5f8d9d27d956 100755
--- a/src/bootstrap/configure.py
+++ b/src/bootstrap/configure.py
@@ -397,7 +397,7 @@ def is_number(value):
   try:
     float(value)
     return True
-  except:
+  except ValueError:
     return False
 
 # Here we walk through the constructed configuration we have from the parsed