diff --git a/sys/conf/files.i386 b/sys/conf/files.i386
index 6abec1d900c4..c29497e4d01e 100644
--- a/sys/conf/files.i386
+++ b/sys/conf/files.i386
@@ -7,27 +7,27 @@
 # limitations in config: backslash-newline doesn't work in strings, and
 # dependency lines other than the first are silently ignored.
 #
-linux_genassym			optional	compat_linux		   \
+linux_genassym.o		optional	compat_linux		   \
 	dependency 	"$S/i386/linux/linux_genassym.c $S/i386/linux/linux.h" \
-	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ $<"	   \
+	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ -c $<"	   \
 	no-obj no-implicit-rule						   \
-	clean		"linux_genassym"
+	clean		"linux_genassym.o"
 #
-svr4_genassym			optional	compat_svr4		   \
+svr4_genassym.o			optional	compat_svr4		   \
 	dependency 	"$S/i386/svr4/svr4_genassym.c $S/svr4/svr4.h"	   \
-	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ $<"	   \
+	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ -c $<"	   \
 	no-obj no-implicit-rule						   \
-	clean		"svr4_genassym"
+	clean		"svr4_genassym.o"
 #
 linux_assym.h			optional	compat_linux		   \
-	dependency 	"linux_genassym"				   \
-	compile-with	"./linux_genassym > $@"				   \
+	dependency 	"linux_genassym.o"				   \
+	compile-with	"genassym -o $@ linux_genassym.o"		   \
 	no-obj no-implicit-rule before-depend				   \
 	clean		"linux_assym.h"
 #
 svr4_assym.h			optional	compat_svr4		   \
-	dependency 	"svr4_genassym"				   	   \
-	compile-with	"./svr4_genassym > $@"				   \
+	dependency 	"svr4_genassym.o"			   	   \
+	compile-with	"genassym -o $@ svr4_genassym.o"		   \
 	no-obj no-implicit-rule before-depend				   \
 	clean		"svr4_assym.h"
 #
diff --git a/sys/i386/conf/files.i386 b/sys/i386/conf/files.i386
index 6abec1d900c4..c29497e4d01e 100644
--- a/sys/i386/conf/files.i386
+++ b/sys/i386/conf/files.i386
@@ -7,27 +7,27 @@
 # limitations in config: backslash-newline doesn't work in strings, and
 # dependency lines other than the first are silently ignored.
 #
-linux_genassym			optional	compat_linux		   \
+linux_genassym.o		optional	compat_linux		   \
 	dependency 	"$S/i386/linux/linux_genassym.c $S/i386/linux/linux.h" \
-	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ $<"	   \
+	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ -c $<"	   \
 	no-obj no-implicit-rule						   \
-	clean		"linux_genassym"
+	clean		"linux_genassym.o"
 #
-svr4_genassym			optional	compat_svr4		   \
+svr4_genassym.o			optional	compat_svr4		   \
 	dependency 	"$S/i386/svr4/svr4_genassym.c $S/svr4/svr4.h"	   \
-	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ $<"	   \
+	compile-with	"${CC} ${CFLAGS} ${PARAM} -UKERNEL -o $@ -c $<"	   \
 	no-obj no-implicit-rule						   \
-	clean		"svr4_genassym"
+	clean		"svr4_genassym.o"
 #
 linux_assym.h			optional	compat_linux		   \
-	dependency 	"linux_genassym"				   \
-	compile-with	"./linux_genassym > $@"				   \
+	dependency 	"linux_genassym.o"				   \
+	compile-with	"genassym -o $@ linux_genassym.o"		   \
 	no-obj no-implicit-rule before-depend				   \
 	clean		"linux_assym.h"
 #
 svr4_assym.h			optional	compat_svr4		   \
-	dependency 	"svr4_genassym"				   	   \
-	compile-with	"./svr4_genassym > $@"				   \
+	dependency 	"svr4_genassym.o"			   	   \
+	compile-with	"genassym -o $@ svr4_genassym.o"		   \
 	no-obj no-implicit-rule before-depend				   \
 	clean		"svr4_assym.h"
 #