diff --git a/boards/p-l496g-cell02/Makefile.features b/boards/p-l496g-cell02/Makefile.features
index 1b1f160977..4103b7ede0 100644
--- a/boards/p-l496g-cell02/Makefile.features
+++ b/boards/p-l496g-cell02/Makefile.features
@@ -1,6 +1,6 @@
 # the cpu to build for
-export CPU = stm32l4
-export CPU_MODEL = stm32l496ag
+CPU = stm32l4
+CPU_MODEL = stm32l496ag
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_i2c
diff --git a/boards/stm32f723e-disco/Makefile.features b/boards/stm32f723e-disco/Makefile.features
index ff014090b4..24cc39355d 100644
--- a/boards/stm32f723e-disco/Makefile.features
+++ b/boards/stm32f723e-disco/Makefile.features
@@ -1,6 +1,6 @@
 # define the cpu used by the stm32f723e-disco board
-export CPU = stm32f7
-export CPU_MODEL = stm32f723ie
+CPU = stm32f7
+CPU_MODEL = stm32f723ie
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_i2c