diff --git a/cpu/efm32/families/efm32gg/system.c b/cpu/efm32/families/efm32gg/system.c
index 7fe85777b6..376afe7bfe 100644
--- a/cpu/efm32/families/efm32gg/system.c
+++ b/cpu/efm32/families/efm32gg/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efm32hg/system.c b/cpu/efm32/families/efm32hg/system.c
index f2a96a12c8..2c0bfe76f7 100644
--- a/cpu/efm32/families/efm32hg/system.c
+++ b/cpu/efm32/families/efm32hg/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efm32lg/system.c b/cpu/efm32/families/efm32lg/system.c
index ccc1ae327a..1d01e15a60 100644
--- a/cpu/efm32/families/efm32lg/system.c
+++ b/cpu/efm32/families/efm32lg/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efm32pg12b/system.c b/cpu/efm32/families/efm32pg12b/system.c
index e60114ebfc..e5da97849e 100644
--- a/cpu/efm32/families/efm32pg12b/system.c
+++ b/cpu/efm32/families/efm32pg12b/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efm32pg1b/system.c b/cpu/efm32/families/efm32pg1b/system.c
index e60114ebfc..e5da97849e 100644
--- a/cpu/efm32/families/efm32pg1b/system.c
+++ b/cpu/efm32/families/efm32pg1b/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efm32zg/system.c b/cpu/efm32/families/efm32zg/system.c
index 1fa5380883..da91633e7e 100644
--- a/cpu/efm32/families/efm32zg/system.c
+++ b/cpu/efm32/families/efm32zg/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efr32mg12p/system.c b/cpu/efm32/families/efr32mg12p/system.c
index f8341d0972..1d4ca4f641 100644
--- a/cpu/efm32/families/efr32mg12p/system.c
+++ b/cpu/efm32/families/efr32mg12p/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efr32mg1b/system.c b/cpu/efm32/families/efr32mg1b/system.c
index c7dae5f56f..6b062559c9 100644
--- a/cpu/efm32/families/efr32mg1b/system.c
+++ b/cpu/efm32/families/efr32mg1b/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efr32mg1p/system.c b/cpu/efm32/families/efr32mg1p/system.c
index c7dae5f56f..6b062559c9 100644
--- a/cpu/efm32/families/efr32mg1p/system.c
+++ b/cpu/efm32/families/efr32mg1p/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/efr32zg23/system.c b/cpu/efm32/families/efr32zg23/system.c
index 5f7e7fdf6a..49e4f681fb 100644
--- a/cpu/efm32/families/efr32zg23/system.c
+++ b/cpu/efm32/families/efr32zg23/system.c
@@ -29,6 +29,7 @@
  *****************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************
diff --git a/cpu/efm32/families/ezr32wg/system.c b/cpu/efm32/families/ezr32wg/system.c
index 84de1f56f5..e8ae9ac164 100644
--- a/cpu/efm32/families/ezr32wg/system.c
+++ b/cpu/efm32/families/ezr32wg/system.c
@@ -29,6 +29,7 @@
  ******************************************************************************/
 
 #include <stdint.h>
+#include "periph_conf.h"
 #include "em_device.h"
 
 /*******************************************************************************