diff --git a/guile-readline/Makefile.am b/guile-readline/Makefile.am
index 391d59516..d6eb75648 100644
--- a/guile-readline/Makefile.am
+++ b/guile-readline/Makefile.am
@@ -47,7 +47,7 @@ ice9_DATA = readline.scm
 snarfcppopts = $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)
 SUFFIXES = .x
 .c.x:
-	$(GUILE_SNARF) $< $(snarfcppopts)
+	$(GUILE_SNARF) -o $@ $< $(snarfcppopts)
 
 EXTRA_DIST = LIBGUILEREADLINE-VERSION readline.scm
 
diff --git a/libguile/Makefile.am b/libguile/Makefile.am
index 52f09bbf0..617c07a18 100644
--- a/libguile/Makefile.am
+++ b/libguile/Makefile.am
@@ -192,7 +192,7 @@ snarfcppopts = $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)
 
 SUFFIXES = .x .doc
 .c.x:
-	./guile-snarf $< $(snarfcppopts)
+	./guile-snarf -o $@ $< $(snarfcppopts)
 .c.doc:
 	-(test -n "${AWK+set}" || AWK="@AWK@"; ${AWK} -f ./guile-func-name-check $<)
 	(./guile-snarf-docs $(snarfcppopts) $< | \
diff --git a/srfi/Makefile.am b/srfi/Makefile.am
index 075fa78c5..c010d5e77 100644
--- a/srfi/Makefile.am
+++ b/srfi/Makefile.am
@@ -69,6 +69,6 @@ snarfcppopts = $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)
 
 SUFFIXES = .x
 .c.x:
-	$(GUILE_SNARF) $< $(snarfcppopts)
+	$(GUILE_SNARF) -o $@ $< $(snarfcppopts)
 
 CLEANFILES = *.x