diff --git a/kerberos5/lib/libasn1/Makefile b/kerberos5/lib/libasn1/Makefile
index 94c79db6759..8390d61c7f8 100644
--- a/kerberos5/lib/libasn1/Makefile
+++ b/kerberos5/lib/libasn1/Makefile
@@ -103,10 +103,10 @@ ${GEN_KX509}: kx509.asn1
 .SUFFIXES: .h .c .x .hx
 
 .x.c:
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .hx.h:
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 	
 .include <bsd.lib.mk>
 
diff --git a/kerberos5/lib/libgssapi_spnego/Makefile b/kerberos5/lib/libgssapi_spnego/Makefile
index 00d299e32a2..0220b40b74b 100644
--- a/kerberos5/lib/libgssapi_spnego/Makefile
+++ b/kerberos5/lib/libgssapi_spnego/Makefile
@@ -45,10 +45,10 @@ ${GEN}: spnego.asn1 spnego.opt
 .SUFFIXES: .h .c .x .hx
 
 .x.c:   
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .hx.h:
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .include <bsd.lib.mk>
 
diff --git a/kerberos5/lib/libhdb/Makefile b/kerberos5/lib/libhdb/Makefile
index 87a72ddef2d..40efd6a5f81 100644
--- a/kerberos5/lib/libhdb/Makefile
+++ b/kerberos5/lib/libhdb/Makefile
@@ -90,10 +90,10 @@ ${GEN}: hdb.asn1
 .SUFFIXES: .h .c .x .hx
 
 .x.c:   
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .hx.h:
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .include <bsd.lib.mk>
 
diff --git a/kerberos5/lib/libhx509/Makefile b/kerberos5/lib/libhx509/Makefile
index 469950a18e7..34c1fa57dea 100644
--- a/kerberos5/lib/libhx509/Makefile
+++ b/kerberos5/lib/libhx509/Makefile
@@ -283,10 +283,10 @@ ${GEN_CRMF}: crmf.asn1
 .SUFFIXES: .h .c .x .hx
 
 .x.c:   
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .hx.h:
-	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cp ${.IMPSRC} ${.TARGET}
+	cmp -s ${.IMPSRC} ${.TARGET} 2> /dev/null || cat ${.IMPSRC} > ${.TARGET}
 
 .include <bsd.lib.mk>