diff --git a/appl/xnlock/Makefile.in b/appl/xnlock/Makefile.in
index 56c036bc0..2a2c5939d 100644
--- a/appl/xnlock/Makefile.in
+++ b/appl/xnlock/Makefile.in
@@ -8,7 +8,7 @@ XLIBS = @X_LIBS@ -lXt @X_PRE_LIBS@ -lX11 @X_EXTRA_LIBS@
 
 CC = @CC@
 RANLIB = @RANLIB@
-DEFS = @DEFS@
+DEFS = @DEFS@ -DBINDIR='"$(bindir)"'
 CFLAGS = $(XINCS) @CFLAGS@
 LD_FLAGS = @LD_FLAGS@
 LIBS = $(XLIBS) @LIBS@
diff --git a/appl/xnlock/xnlock.c b/appl/xnlock/xnlock.c
index 389c4c0a1..f371f7853 100644
--- a/appl/xnlock/xnlock.c
+++ b/appl/xnlock/xnlock.c
@@ -250,7 +250,7 @@ zrefresh()
   case 0:
       /* Child */
       execlp("zrefresh", "zrefresh", 0);
-      execl("/usr/athena/bin/zrefresh", "zrefresh", 0);
+      execl(BINDIR "/zrefresh", "zrefresh", 0);
 #if 0
       fprintf(stderr, "Warning %s: Failed to exec zrefresh\n", ProgName);
 #endif