diff --git a/src/odt.c b/src/odt.c
index cda5ece..60fe465 100644
--- a/src/odt.c
+++ b/src/odt.c
@@ -73,7 +73,7 @@ createOutputDocument(const char* const outputFilename, const char* const tempDir
     if ((child_pid = fork()) == 0) {
         /* you are the child */
         char outputRealPath[FILENAME_MAX];
-        char* const args[] = { "zip", "-r", outputRealPath, ".", NULL };
+        char* const args[] = { "zip", "-r", outputRealPath, "mimetype", ".", NULL };
         realpath(outputFilename, outputRealPath);
         chdir(tempDir);
         freopen("/dev/null", "w", stdout);