diff --git a/support/make/btnode3.target b/support/make/btnode3.target
index 7f8887b..d041282 100644
--- a/support/make/btnode3.target
+++ b/support/make/btnode3.target
@@ -1,7 +1,7 @@
 #-*-Makefile-*- vim:syntax=make
 #$Id: btnode3.target,v 1.5 2007-11-06 19:32:56 sallai Exp $
 
-PLATFORM ?= btnode3
+PLATFORM = btnode3
 SENSORBOARD ?= micasb
 PROGRAMMER ?= uisp
 ifeq ($(PROGRAMMER),avrdude)
diff --git a/support/make/epic.target b/support/make/epic.target
index 78d1236..605c57b 100644
--- a/support/make/epic.target
+++ b/support/make/epic.target
@@ -1,7 +1,7 @@
 #-*-Makefile-*-
 #$Id: epic.target,v 1.5 2010-02-26 23:36:34 sdhsdh Exp $
 
-PLATFORM ?= epic
+PLATFORM = epic
 
 # Disable MSP430 hardware multiply because it makes MSPGCC die
 PFLAGS += -mdisable-hwmul
diff --git a/support/make/telosa.target b/support/make/telosa.target
index eac0e51..e360185 100644
--- a/support/make/telosa.target
+++ b/support/make/telosa.target
@@ -1,7 +1,7 @@
 #-*-Makefile-*- vim:syntax=make
 #$Id: telosa.target,v 1.6 2008-03-11 09:34:13 klueska Exp $
 
-PLATFORM ?= telosa
+PLATFORM = telosa
 
 MSP_MCU = msp430x149
 
diff --git a/support/make/telosb.target b/support/make/telosb.target
index a4c6d05..3245ebe 100644
--- a/support/make/telosb.target
+++ b/support/make/telosb.target
@@ -1,7 +1,7 @@
 #-*-Makefile-*- vim:syntax=make
 #$Id: telosb.target,v 1.5 2008-03-11 09:34:13 klueska Exp $
 
-PLATFORM ?= telosb
+PLATFORM = telosb
 
 #MSP_MCU = msp430x1611