diff --git a/drudge/drs.py b/drudge/drs.py
index c807eff..a41a17e 100644
--- a/drudge/drs.py
+++ b/drudge/drs.py
@@ -255,7 +255,7 @@ class _NumFixer(ast.NodeTransformer):
     Integer literals will be changed into creation of symbolic integers.
     """
 
-    def visit_Num(self, node: ast.Constant):
+    def visit_Constant(self, node: ast.Constant):
         """Update the number nodes."""
         val = node.value
         if isinstance(val, int):
@@ -265,7 +265,7 @@ def visit_Num(self, node: ast.Constant):
             ast.copy_location(fixed, node)
             return fixed
         else:
-            return val
+            return node
 
 
 _DEF_METH_NAME = 'def_as'
diff --git a/drudge/report.py b/drudge/report.py
index a839096..9e3ff93 100644
--- a/drudge/report.py
+++ b/drudge/report.py
@@ -153,8 +153,6 @@ def write(self):
                         _PDFLATEX, filename, stat.stdout, stat.stderr
                     )
                     warnings.warn(err_msg)
-            else:
-                warnings.warn('{} cannot be found.'.format(_PDFLATEX))
 
 
 _PDFLATEX = 'pdflatex'