diff --git a/boards/ikea-tradfri/Makefile.features b/boards/ikea-tradfri/Makefile.features
index 0c16294284..2328dfdef8 100644
--- a/boards/ikea-tradfri/Makefile.features
+++ b/boards/ikea-tradfri/Makefile.features
@@ -1,4 +1,5 @@
 CPU = efm32
+CPU_FAM = efr32mg1p
 CPU_MODEL = efr32mg1p132f256gm32
 
 # Put defined MCU peripherals here (in alphabetical order)
diff --git a/boards/slstk3401a/Makefile.features b/boards/slstk3401a/Makefile.features
index 9c14770927..23175cb16f 100644
--- a/boards/slstk3401a/Makefile.features
+++ b/boards/slstk3401a/Makefile.features
@@ -1,4 +1,5 @@
 CPU = efm32
+CPU_FAM = efm32pg1b
 CPU_MODEL = efm32pg1b200f256gm48
 
 # Put defined MCU peripherals here (in alphabetical order)
diff --git a/boards/slstk3402a/Makefile.features b/boards/slstk3402a/Makefile.features
index 6951ba6bc9..0fcef2f8e9 100644
--- a/boards/slstk3402a/Makefile.features
+++ b/boards/slstk3402a/Makefile.features
@@ -1,4 +1,5 @@
 CPU = efm32
+CPU_FAM = efm32pg12b
 CPU_MODEL = efm32pg12b500f1024gl125
 
 # Put defined MCU peripherals here (in alphabetical order)
diff --git a/boards/sltb001a/Makefile.features b/boards/sltb001a/Makefile.features
index ee28cf5d8a..67963fd37c 100644
--- a/boards/sltb001a/Makefile.features
+++ b/boards/sltb001a/Makefile.features
@@ -1,4 +1,5 @@
 CPU = efm32
+CPU_FAM = efr32mg1p
 CPU_MODEL = efr32mg1p132f256gm48
 
 # Put defined MCU peripherals here (in alphabetical order)
diff --git a/boards/slwstk6000b-slwrb4150a/Makefile.features b/boards/slwstk6000b-slwrb4150a/Makefile.features
index 50a9307d14..4890267050 100644
--- a/boards/slwstk6000b-slwrb4150a/Makefile.features
+++ b/boards/slwstk6000b-slwrb4150a/Makefile.features
@@ -1,3 +1,4 @@
 # HACK this should be deduced from the daughter board in 'common/slwstk6000b'
+CPU_FAM = efr32mg1p
 CPU_MODEL = efr32mg1p233f256gm48
 include $(RIOTBOARD)/common/slwstk6000b/Makefile.features
diff --git a/boards/slwstk6000b-slwrb4162a/Makefile.features b/boards/slwstk6000b-slwrb4162a/Makefile.features
index 5667afc2fb..756fd27081 100644
--- a/boards/slwstk6000b-slwrb4162a/Makefile.features
+++ b/boards/slwstk6000b-slwrb4162a/Makefile.features
@@ -1,3 +1,4 @@
 # HACK this should be deduced from the daughter board in 'common/slwstk6000b'
+CPU_FAM = efr32mg12p
 CPU_MODEL = efr32mg12p332f1024gl125
 include $(RIOTBOARD)/common/slwstk6000b/Makefile.features
diff --git a/boards/stk3600/Makefile.features b/boards/stk3600/Makefile.features
index 86a7660658..5f5425fb2f 100644
--- a/boards/stk3600/Makefile.features
+++ b/boards/stk3600/Makefile.features
@@ -1,4 +1,5 @@
 CPU = efm32
+CPU_FAM = efm32lg
 CPU_MODEL = efm32lg990f256
 
 # Put defined MCU peripherals here (in alphabetical order)
diff --git a/boards/stk3700/Makefile.features b/boards/stk3700/Makefile.features
index 44c1f5a58c..4341bb4caf 100644
--- a/boards/stk3700/Makefile.features
+++ b/boards/stk3700/Makefile.features
@@ -1,4 +1,5 @@
 CPU = efm32
+CPU_FAM = efm32gg
 CPU_MODEL = efm32gg990f1024
 
 # Put defined MCU peripherals here (in alphabetical order)