diff --git a/GNUmakefile b/GNUmakefile
index a5ab92d..5e7fab3 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -19,5 +19,5 @@ install: all
 	install -Dm755 $(PROG) $(DESTDIR)$(PREFIX)/$(BIN)/$(PROG)
 	install -Dm644 doc/$(PROG).1 $(DESTDIR)$(MAN)/man1/$(PROG).1
 # completions need to go in one specific place :)
-	install -Dm644 completions/zsh.zsh $(DESTDIR)/usr/$(SHARE)/zsh/site-functions/_$(PROG)
+	install -Dm644 completions/zsh.zsh $(DESTDIR)/$(PREFIX)/$(SHARE)/zsh/site-functions/_$(PROG)
 endif
diff --git a/Makefile b/Makefile
index d8777ec..d8d8c68 100644
--- a/Makefile
+++ b/Makefile
@@ -11,4 +11,4 @@ install: all
 	install -Dm755 $(PROG) $(DESTDIR)$(PREFIX)/$(BIN)/$(PROG)
 	install -Dm644 doc/$(PROG).1 $(DESTDIR)$(MAN)/man1/$(PROG).1
 # completions need to go in one specific place :)
-	install -Dm644 completions/zsh.zsh $(DESTDIR)/usr/$(SHARE)/zsh/site-functions/_$(PROG)
\ No newline at end of file
+	install -Dm644 completions/zsh.zsh $(DESTDIR)/$(PREFIX)/$(SHARE)/zsh/site-functions/_$(PROG)
\ No newline at end of file