diff --git a/src/uutils.c b/src/uutils.c
index 5a6607b..e3a58b2 100644
--- a/src/uutils.c
+++ b/src/uutils.c
@@ -219,6 +219,8 @@ LispPTR unix_getparm(LispPTR *args) {
   } else if (strcmp(envname, "DISPLAY") == 0) {
 #if defined(XWINDOW)
     envvalue = "X";
+#elif defined(SDL)
+    envvalue = "SDL";
 #elif defined(DISPLAYBUFFER)
     envvalue = "BUFFERED";
 #else