diff --git a/src/lyskom/Makefile b/src/lyskom/Makefile
index a48f498fac5803138378ac065c212ff66387ae21..f88c5fd86535567f321a606378d90ede78c5565d 100644
--- a/src/lyskom/Makefile
+++ b/src/lyskom/Makefile
@@ -1,7 +1,7 @@
 # Makefile for lyskom Nagios utilities
 
 PREFIX=/usr/local/nagios
-LIBEXECDIR=$prefix/libexec/
+LIBEXECDIR=$(PREFIX)/libexec/
 PROGS=notify_lyskom check_lyskom
 COBJS=lyskom.o buffer.o