diff --git a/dix/dispatch.c b/dix/dispatch.c
index 81a160e11..968bba1be 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -104,6 +104,9 @@ Equipment Corporation.
 #include "windowstr.h"
 #include <X11/fonts/fontstruct.h>
 #include <X11/fonts/libxfont2.h>
+
+#include "os/osdep.h"
+
 #include "dixfontstr.h"
 #include "gcstruct.h"
 #include "selection.h"
diff --git a/include/os.h b/include/os.h
index 6355fc5e1..07ffde7ec 100644
--- a/include/os.h
+++ b/include/os.h
@@ -302,14 +302,6 @@ LockServer(void);
 extern _X_EXPORT void
 UnlockServer(void);
 
-extern _X_EXPORT Bool
-OsLookupColor(int /*screen */ ,
-              char * /*name */ ,
-              unsigned /*len */ ,
-              unsigned short * /*pred */ ,
-              unsigned short * /*pgreen */ ,
-              unsigned short * /*pblue */ );
-
 extern _X_EXPORT void
 OsInit(void);
 
diff --git a/os/oscolor.c b/os/oscolor.c
index 5f55b25fb..996d684d8 100644
--- a/os/oscolor.c
+++ b/os/oscolor.c
@@ -49,6 +49,9 @@ SOFTWARE.
 #endif
 
 #include <X11/keysym.h>
+
+#include "os/osdep.h"
+
 #include "dix.h"
 #include "os.h"
 
diff --git a/os/osdep.h b/os/osdep.h
index 2999884c4..677756624 100644
--- a/os/osdep.h
+++ b/os/osdep.h
@@ -224,6 +224,14 @@ void AutoResetServer(int sig);
 /* clone fd so it gets out of our select mask */
 int os_move_fd(int fd);
 
+/* lookup builtin color by name */
+Bool OsLookupColor(int screen,
+                   char *name,
+                   unsigned len,
+                   unsigned short *pred,
+                   unsigned short *pgreen,
+                   unsigned short *pblue);
+
 /* set signal mask - either on current thread or whole process,
    depending on whether multithreading is used */
 int xthread_sigmask(int how, const sigset_t *set, sigset_t *oldest);