diff --git a/db_converter.py b/db_converter.py
index 439957b..a099f78 100644
--- a/db_converter.py
+++ b/db_converter.py
@@ -83,7 +83,7 @@ def parse(input_filename, output_filename):
                 creation_lines = []
             # Inserting data into a table?
             elif line.startswith("INSERT INTO"):
-                output.write(line.encode("utf8").replace("'0000-00-00 00:00:00'", "NULL") + "\n")
+                output.write(re.sub(r"([^'])'0000-00-00 00:00:00'", r"\1NULL", line.encode("utf8")) + "\n")
                 num_inserts += 1
             # ???
             else: