diff --git a/src/mod/codecs/mod_ilbc/Makefile b/src/mod/codecs/mod_ilbc/Makefile
index fca877d9ec..520c7c6c40 100644
--- a/src/mod/codecs/mod_ilbc/Makefile
+++ b/src/mod/codecs/mod_ilbc/Makefile
@@ -1,11 +1,12 @@
 BASE=../../../..
-ILBC_DIR=$(BASE)/libs/ilbc
-ILBCLA=$(ILBC_DIR)/src/libilbc.la
+ILBC_DIR=$(switch_srcdir)/libs/ilbc
+ILBC_BUILDDIR=$(switch_builddir)/libs/ilbc
+ILBCLA=$(ILBC_BUILDDIR)/src/libilbc.la
 LOCAL_CFLAGS=-I$(ILBC_DIR)/src
 LOCAL_LIBADD=$(ILBCLA)
 
 include $(BASE)/build/modmake.rules
 
 $(ILBCLA): $(ILBC_DIR) $(ILBC_DIR)/.update
-	cd $(ILBC_DIR) && $(MAKE)
+	cd $(ILBC_BUILDDIR) && $(MAKE)
 	$(TOUCH_TARGET)
diff --git a/src/mod/codecs/mod_siren/Makefile b/src/mod/codecs/mod_siren/Makefile
index 9c5139ab13..bb044a449d 100644
--- a/src/mod/codecs/mod_siren/Makefile
+++ b/src/mod/codecs/mod_siren/Makefile
@@ -1,10 +1,11 @@
 BASE=../../../..
-G722_1_DIR=$(BASE)/libs/libg722_1
+G722_1_DIR=$(switch_srcdir)/libs/libg722_1
+G722_1_BUILDDIR=$(switch_builddir)/libs/libg722_1
 LOCAL_CFLAGS=-I$(G722_1_DIR)/src 
-G722_1_LA=$(G722_1_DIR)/src/.libs/libg722_1.la
+G722_1_LA=$(G722_1_BUILDDIR)/src/.libs/libg722_1.la
 LOCAL_LIBADD=$(G722_1_LA)
 include $(BASE)/build/modmake.rules
 
 $(G722_1_LA): $(G722_1_DIR)/.update	
-	cd $(G722_1_DIR) && $(MAKE)
+	cd $(G722_1_BUILDDIR) && $(MAKE)
 	$(TOUCH_TARGET)