Index: src/OFDate.m
==================================================================
--- src/OFDate.m
+++ src/OFDate.m
@@ -109,11 +109,11 @@
 
 #if (!defined(HAVE_GMTIME_R) || !defined(HAVE_LOCALTIME_R)) && \
     defined(OF_HAVE_THREADS)
 static OFMutex *mutex;
 
-void
+static void
 releaseMutex(void)
 {
 	[mutex release];
 }
 #endif

Index: src/OFFileURLHandler.m
==================================================================
--- src/OFFileURLHandler.m
+++ src/OFFileURLHandler.m
@@ -108,20 +108,20 @@
 #endif
 
 #if defined(OF_FILE_MANAGER_SUPPORTS_OWNER) && defined(OF_HAVE_THREADS)
 static OFMutex *passwdMutex;
 
-void
+static void
 releasePasswdMutex(void)
 {
 	[passwdMutex release];
 }
 #endif
 #if !defined(HAVE_READDIR_R) && defined(OF_HAVE_THREADS) && !defined(OF_WINDOWS)
 static OFMutex *readdirMutex;
 
-void
+static void
 releaseReaddirMutex(void)
 {
 	[readdirMutex release];
 }
 #endif

Index: src/OFURLHandler.m
==================================================================
--- src/OFURLHandler.m
+++ src/OFURLHandler.m
@@ -35,11 +35,11 @@
 
 static OFMutableDictionary OF_GENERIC(OFString *, OFURLHandler *) *handlers;
 #ifdef OF_HAVE_THREADS
 static OFMutex *mutex;
 
-void
+static void
 releaseMutex(void)
 {
 	[mutex release];
 }
 #endif