diff --git a/include/lighttpd/mimetype.h b/include/lighttpd/mimetype.h
index 3a2e17d..82e1799 100644
--- a/include/lighttpd/mimetype.h
+++ b/include/lighttpd/mimetype.h
@@ -11,7 +11,7 @@ typedef struct liMimetypeNode liMimetypeNode;
 
 LI_API liMimetypeNode *li_mimetype_node_new(void);
 LI_API void li_mimetype_node_free(liMimetypeNode *node);
-LI_API void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *mimetype, guint depth);
+LI_API void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *mimetype);
 
 /* looks up the mimetype for a filename by comparing suffixes. longest match is returned. do not free the result */
 LI_API GString *li_mimetype_get(liVRequest *vr, GString *filename);
diff --git a/src/main/mimetype.c b/src/main/mimetype.c
index c6c3c16..ce296b9 100644
--- a/src/main/mimetype.c
+++ b/src/main/mimetype.c
@@ -9,11 +9,11 @@
 #define MIME_UNMARK_NODE(x)		((gpointer)((uintptr_t)x & (~1)))
 #define MIME_IS_NODE(x)			(1 == ((uintptr_t)x & 1))
 
-LI_API liMimetypeNode *li_mimetype_node_new(void) {
+liMimetypeNode *li_mimetype_node_new(void) {
 	return g_slice_new0(liMimetypeNode);
 }
 
-LI_API void li_mimetype_node_free(liMimetypeNode *node) {
+void li_mimetype_node_free(liMimetypeNode *node) {
 	guint i;
 	gpointer ptr;
 
@@ -39,7 +39,7 @@ LI_API void li_mimetype_node_free(liMimetypeNode *node) {
 	g_slice_free(liMimetypeNode, node);
 }
 
-LI_API void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *mimetype, guint depth) {
+static void mimetype_insert(liMimetypeNode *node, GString *suffix, GString *mimetype, guint depth) {
 	guchar c, cdiff;
 	gpointer ptr;
 	liMimetypeNode *next_node;
@@ -60,8 +60,7 @@ LI_API void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *m
 	if (NULL == node->children) {
 		node->cmin = node->cmax = c;
 		node->children = g_malloc(sizeof(gpointer));
-		node->children[0] = mimetype;
-		return;
+		node->children[0] = NULL;
 	} else if (c < node->cmin) {
 		cdiff = node->cmin - c; /* how much space we need in front */
 		node->children = g_realloc(node->children, sizeof(gpointer) * (MIME_COUNT_CHILDREN(node) + cdiff)); /* make room for more children */
@@ -77,17 +76,11 @@ LI_API void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *m
 
 	ptr = node->children[c - node->cmin];
 
-	/* slot not used yet, just point to mimetype */
-	if (ptr == NULL) {
-		node->children[c - node->cmin] = mimetype;
-		return;
-	}
-
-	/* slot contains another node */
-	if (MIME_IS_NODE(ptr)) {
+	if (NULL != ptr && MIME_IS_NODE(ptr)) {
+		/* slot contains another node */
 		next_node = MIME_UNMARK_NODE(ptr);
 	} else {
-		/* slot contains a mimetype, split into node */
+		/* slot not used yet or contains a mimetype, split into node */
 		next_node = g_slice_new(liMimetypeNode);
 		next_node->mimetype = ptr;
 		next_node->cmax = next_node->cmin = 0;
@@ -95,10 +88,14 @@ LI_API void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *m
 		node->children[c - node->cmin] = MIME_MARK_NODE(next_node);
 	}
 
-	li_mimetype_insert(next_node, suffix, mimetype, depth+1);
+	mimetype_insert(next_node, suffix, mimetype, depth+1);
+}
+
+void li_mimetype_insert(liMimetypeNode *node, GString *suffix, GString *mimetype) {
+	mimetype_insert(node, suffix, mimetype, 0);
 }
 
-LI_API GString *li_mimetype_get(liVRequest *vr, GString *filename) {
+GString *li_mimetype_get(liVRequest *vr, GString *filename) {
 	/* search in mime_types option for the longest suffix match */
 	GString *mimetype;
 	liMimetypeNode *node;
diff --git a/src/main/plugin_core.c b/src/main/plugin_core.c
index a45ac5c..0fbc0f1 100644
--- a/src/main/plugin_core.c
+++ b/src/main/plugin_core.c
@@ -1404,7 +1404,7 @@ static gboolean core_option_mime_types_parse(liServer *srv, liWorker *wrk, liPlu
 			return FALSE;
 		}
 
-		li_mimetype_insert(node, v1->data.string, li_value_extract_string(v2), 0);
+		li_mimetype_insert(node, v1->data.string, li_value_extract_string(v2));
 	}
 
 	return TRUE;
diff --git a/tests/requests.py b/tests/requests.py
index bc71b68..c00de73 100644
--- a/tests/requests.py
+++ b/tests/requests.py
@@ -121,7 +121,7 @@ class CurlRequest(TestBase):
 				raise CurlRequestException("Didn't get wanted response header '%s'" % (k))
 			v1 = self.resp_headers[k]
 			if v1 != v:
-				raise CurlRequestException("Unexpected response header '%s' = '%s' (wanted '%s')" % (k, v, v1))
+				raise CurlRequestException("Unexpected response header '%s' = '%s' (wanted '%s')" % (k, v1, v))
 
 		return True
 
diff --git a/tests/t-mime-type.py b/tests/t-mime-type.py
new file mode 100644
index 0000000..5ad73ae
--- /dev/null
+++ b/tests/t-mime-type.py
@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+
+from base import *
+from requests import *
+
+
+class TestMimeType1(CurlRequest):
+	URL = "/test.txt"
+	EXPECT_RESPONSE_BODY = ""
+	EXPECT_RESPONSE_CODE = 200
+	EXPECT_RESPONSE_HEADERS = [ ("Content-Type", "text/plain; charset=utf-8") ]
+
+class TestMimeType2(CurlRequest):
+	URL = "/test.xt"
+	EXPECT_RESPONSE_BODY = ""
+	EXPECT_RESPONSE_CODE = 200
+	EXPECT_RESPONSE_HEADERS = [ ("Content-Type", "text/plain") ]
+
+class TestMimeType3(CurlRequest):
+	URL = "/test.rxt"
+	EXPECT_RESPONSE_BODY = ""
+	EXPECT_RESPONSE_CODE = 200
+	EXPECT_RESPONSE_HEADERS = [ ("Content-Type", "text/strange") ]
+
+class Test(GroupTest):
+	group = [TestMimeType1,TestMimeType2,TestMimeType3]
+
+	def Prepare(self):
+		self.PrepareVHostFile("test.txt", "")
+		self.PrepareVHostFile("test.xt", "")
+		self.PrepareVHostFile("test.rxt", "")
+		self.config = """
+mime_types = (
+	".txt" => "text/plain; charset=utf-8",
+	".xt" => "text/plain",
+	".rxt" => "text/strange",
+	"xt" => "should-not-trigger"
+);
+"""