diff --git a/tools/pioasm/python_output.cpp b/tools/pioasm/python_output.cpp
index 5e68458..5964d55 100644
--- a/tools/pioasm/python_output.cpp
+++ b/tools/pioasm/python_output.cpp
@@ -260,11 +260,14 @@ struct python_output : public output_format {
                     op("mov");
                     std::string guts = dest + ", ";
                     if (operation == 1) {
-                        guts += "not ";
+                        guts += "invert(";
                     } else if (operation == 2) {
-                        guts += "reverse ";
+                        guts += "reverse(";
                     }
                     guts += source;
+                    if (operation == 1 || operation == 2) {
+                        guts += ")";
+                    }
                     op_guts(guts);
                 }
                 break;