diff --git a/scheduler/mime.c b/scheduler/mime.c
index 70dc7bf..80168b9 100644
--- a/scheduler/mime.c
+++ b/scheduler/mime.c
@@ -156,6 +156,9 @@ mimeDeleteType(mime_t      *mime,	/* I - MIME database */
   if (!mime || !mt)
     return;
 
+  if (--mt->refcount != 0)
+    return;
+
   cupsArrayRemove(mime->types, mt);
 
   delete_rules(mt->rules);
diff --git a/scheduler/mime.h b/scheduler/mime.h
index 0afc8d1..9928b86 100644
--- a/scheduler/mime.h
+++ b/scheduler/mime.h
@@ -89,6 +89,7 @@ typedef struct _mime_type_s		/**** MIME Type Data ****/
   int		priority;		/* Priority of this type */
   char		super[MIME_MAX_SUPER],	/* Super-type name ("image", "application", etc.) */
 		type[MIME_MAX_TYPE];	/* Type name ("png", "postscript", etc.) */
+  short		refcount;		/* Reference count */
 } mime_type_t;
 
 typedef struct _mime_filter_s		/**** MIME Conversion Filter Data ****/
diff --git a/scheduler/type.c b/scheduler/type.c
index 11ef264..2fc6cd1 100644
--- a/scheduler/type.c
+++ b/scheduler/type.c
@@ -84,7 +84,10 @@ mimeAddType(mime_t     *mime,		/* I - MIME database */
   */
 
   if ((temp = mimeType(mime, super, type)) != NULL)
+  {
+    temp->refcount++;
     return (temp);
+  }
 
  /*
   * The type doesn't exist; add it...
@@ -100,6 +103,7 @@ mimeAddType(mime_t     *mime,		/* I - MIME database */
                         strlen(type) + 1)) == NULL)
     return (NULL);
 
+  temp->refcount = 1;
   strlcpy(temp->super, super, sizeof(temp->super));
   strcpy(temp->type, type);		/* Safe: temp->type is allocated */
   temp->priority = 100;