diff --git a/conf/airframes/mm/extra/press_t.xml b/conf/airframes/mm/extra/press_t.xml
index ddfbf40840..b08969c1a1 100755
--- a/conf/airframes/mm/extra/press_t.xml
+++ b/conf/airframes/mm/extra/press_t.xml
@@ -1,4 +1,4 @@
-<!DOCTYPE airframe SYSTEM "airframe.dtd">
+<!DOCTYPE airframe SYSTEM "../../airframe.dtd">
 
 <!-- Funjet Multiplex (http://www.multiplex-rc.de/), Jeti ECO 25
      Tiny 2.11 board (http://paparazzi.enac.fr/wiki/index.php/Tiny_v2)
diff --git a/conf/airframes/mm/extra/probe_t.xml b/conf/airframes/mm/extra/probe_t.xml
index 0b57114834..3d3d9b0982 100755
--- a/conf/airframes/mm/extra/probe_t.xml
+++ b/conf/airframes/mm/extra/probe_t.xml
@@ -1,5 +1,4 @@
-<!DOCTYPE airframe SYSTEM "airframe.dtd">
-
+<!DOCTYPE airframe SYSTEM "../../airframe.dtd">
 
 <airframe name="Pressure test">
 
diff --git a/conf/airframes/mm/extra/turbine_trigger.xml b/conf/airframes/mm/extra/turbine_trigger.xml
index dac950f0de..ec96593f8b 100644
--- a/conf/airframes/mm/extra/turbine_trigger.xml
+++ b/conf/airframes/mm/extra/turbine_trigger.xml
@@ -1,4 +1,4 @@
-<!DOCTYPE airframe SYSTEM "airframe.dtd">
+<!DOCTYPE airframe SYSTEM "../../airframe.dtd">
 
 <!-- Funjet Multiplex (http://www.multiplex-rc.de/), Jeti ECO 25
      Tiny 2.11 board (http://paparazzi.enac.fr/wiki/index.php/Tiny_v2)