diff --git a/include/os.h b/include/os.h
index 44faf2d7a..ba39cb95b 100644
--- a/include/os.h
+++ b/include/os.h
@@ -280,13 +280,6 @@ extern _X_EXPORT int
 timingsafe_memcmp(const void *b1, const void *b2, size_t len);
 #endif
 
-/* Logging. */
-typedef enum _LogParameter {
-    XLOG_SYNC,
-    XLOG_VERBOSITY,
-    XLOG_FILE_VERBOSITY
-} LogParameter;
-
 /* Flags for log messages. */
 typedef enum {
     X_PROBED,                   /* Value was probed */
@@ -309,8 +302,6 @@ extern void
 LogSetDisplay(void);
 extern _X_EXPORT void
 LogClose(enum ExitCode error);
-extern _X_EXPORT Bool
-LogSetParameter(LogParameter param, int value);
 extern _X_EXPORT void
 LogVMessageVerb(MessageType type, int verb, const char *format, va_list args)
 _X_ATTRIBUTE_PRINTF(3, 0);
diff --git a/os/log.c b/os/log.c
index 541f96f7f..939526fd7 100644
--- a/os/log.c
+++ b/os/log.c
@@ -310,24 +310,6 @@ LogClose(enum ExitCode error)
     }
 }
 
-Bool
-LogSetParameter(LogParameter param, int value)
-{
-    switch (param) {
-    case XLOG_SYNC:
-        logSync = value ? TRUE : FALSE;
-        return TRUE;
-    case XLOG_VERBOSITY:
-        logVerbosity = value;
-        return TRUE;
-    case XLOG_FILE_VERBOSITY:
-        logFileVerbosity = value;
-        return TRUE;
-    default:
-        return FALSE;
-    }
-}
-
 enum {
     LMOD_LONG     = 0x1,
     LMOD_LONGLONG = 0x2,