diff --git a/arch/cpu/msp430/Makefile.msp430 b/arch/cpu/msp430/Makefile.msp430
index 6746aa215125ad17a65c3a4d27b9f7dcee7afe55..9691b2710ad8019541dbabe5fda556364038c079 100644
--- a/arch/cpu/msp430/Makefile.msp430
+++ b/arch/cpu/msp430/Makefile.msp430
@@ -219,7 +219,7 @@ $(COOJA_PATH)/mspsim/build.xml: $(COOJA_PATH)/build.xml
 	@echo '----------------'
 
 $(COOJA_PATH)/mspsim/mspsim.jar: $(COOJA_PATH)/mspsim/build.xml
-	(cd $(COOJA_PATH)/mspsim && ant jar)
+	cd $(COOJA_PATH)/mspsim && ant jar
 
 %.mspsim:	%.${TARGET} ${COOJA_PATH}/mspsim/mspsim.jar
 	java -jar ${COOJA_PATH}/mspsim/mspsim.jar -platform=${TARGET} $<
diff --git a/arch/platform/cooja/Makefile.cooja b/arch/platform/cooja/Makefile.cooja
index a2aa6c270645bdd273c4401e781456f74f4d0c6e..fc8b15f0cd76af62455bc69142634bc8e0171334 100644
--- a/arch/platform/cooja/Makefile.cooja
+++ b/arch/platform/cooja/Makefile.cooja
@@ -27,7 +27,7 @@ ifdef QUICKSTART
 # Create COOJA JAR rule
 $(COOJA_DIR)/dist/cooja.jar:
 	@echo "Creating COOJA Java archive..."
-	(cd $(COOJA_DIR) && ant jar)
+	cd $(COOJA_DIR) && ant jar
 
 # Quickstart rule
 ifneq ($(MAKECMDGOALS),clean)
diff --git a/tests/17-tun-rpl-br/Makefile b/tests/17-tun-rpl-br/Makefile
index 4719ddf1c08b9dfac68c45481265bf060a9c20cd..8eea8e0e7bf744a83d3bfea82d63d4f7f8f205d6 100644
--- a/tests/17-tun-rpl-br/Makefile
+++ b/tests/17-tun-rpl-br/Makefile
@@ -5,6 +5,6 @@ all: cooja
 cooja: $(CONTIKI)/tools/cooja/dist/cooja.jar
 
 $(CONTIKI)/tools/cooja/dist/cooja.jar:
-	(cd $(CONTIKI)/tools/cooja; ant jar)
+	cd $(CONTIKI)/tools/cooja && ant jar
 
 include ../Makefile.script-test
diff --git a/tests/Makefile.simulation-test b/tests/Makefile.simulation-test
index f14618c91b0d518c2d5de68ee7f67c11e33d0f56..903226715c5d8d8096c857e435fb8e206a5abbb2 100644
--- a/tests/Makefile.simulation-test
+++ b/tests/Makefile.simulation-test
@@ -56,4 +56,4 @@ clean:
 
 cooja: $(CONTIKI)/tools/cooja/dist/cooja.jar
 $(CONTIKI)/tools/cooja/dist/cooja.jar:
-	(cd $(CONTIKI)/tools/cooja; ant jar)
+	cd $(CONTIKI)/tools/cooja && ant jar