diff --git a/lib/krb5/Makefile.am b/lib/krb5/Makefile.am
index 3e10dfde3..d3af28bc1 100644
--- a/lib/krb5/Makefile.am
+++ b/lib/krb5/Makefile.am
@@ -90,7 +90,7 @@ libkrb5_a_SOURCES = \
 $(libkrb5_a_OBJECTS): $(srcdir)/krb5-protos.h
 
 $(srcdir)/krb5-protos.h:
-	cd $(srcdir); /opt/perl5/bin/perl ../../aux/make-proto.pl $(libkrb5_a_SOURCES) > krb5-protos.h || rm -f krb5-protos.h
+	cd $(srcdir); perl ../../aux/make-proto.pl $(libkrb5_a_SOURCES) > krb5-protos.h || rm -f krb5-protos.h
 
 INCLUDES = $(INCLUDE_krb4)