diff --git a/Makefile b/Makefile
index 6ad429b..64cfb41 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ TARGET=httpprocwatchd
 
 SYSCTL=${shell which systemctl}
 SYSDDIR=${shell pkg-config systemd --variable=systemdsystemunitdir}
+SYSDDIR=${SYSDDIR:/%=%}
 DESTDIR=/
 
 LDFLAGS=-ldflags "-s -w"