diff --git a/.travis.yml b/.travis.yml
index 3fef7cfe58..e32da1d4d0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,15 +8,13 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then tools/apt-get-install-deps.sh; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then tools/brew-install-deps.sh; fi
 
-install: make prerequisites
+install:
 
 script: "make -j VERBOSE=1 NINJA=1 $TARGET"
 
 env:
   - TARGET="check-signed-off check-vera check-cppcheck"
   - TARGET="build.linux test-js-precommit"
-  - TARGET=build.mcu_stm32f3
-  - TARGET=build.mcu_stm32f4
   - TARGET=test-unit
 
 matrix:
diff --git a/Makefile b/Makefile
index fd2a8714ef..53751a4762 100644
--- a/Makefile
+++ b/Makefile
@@ -227,7 +227,7 @@ $(foreach __SYSTEM,$(NATIVE_SYSTEM) $(MCU_SYSTEMS), \
 # $(3) - target(s) to build with the cmake-generated Makefile
 define BUILD_RULE
 .PHONY: $(1)
-$(1): $$(BUILD_DIR)/$(2)/Makefile prerequisites
+$(1): $$(BUILD_DIR)/$(2)/Makefile
 	$$(Q) $$(call SHLOG,$$(BUILD_COMMAND) -C $$(BUILD_DIR)/$(2) $(3),$$(BUILD_DIR)/$(2)/$(1).log,Build)
 	$$(Q) $$(foreach __TARGET,$(3), \
             mkdir -p $$(OUT_DIR)/$$(__TARGET); \