diff --git a/pkg/fatfs/fatfs_vfs/fatfs_vfs.c b/pkg/fatfs/fatfs_vfs/fatfs_vfs.c
index 08be5d7f51..45fa4263ac 100644
--- a/pkg/fatfs/fatfs_vfs/fatfs_vfs.c
+++ b/pkg/fatfs/fatfs_vfs/fatfs_vfs.c
@@ -29,6 +29,7 @@
 #include "fs/fatfs.h"
 
 #include "time.h"
+#include "mutex.h"
 
 #define ENABLE_DEBUG 0
 #include <debug.h>
diff --git a/tests/pkg_fatfs_vfs/Makefile b/tests/pkg_fatfs_vfs/Makefile
index 30676ecac9..b7d44eabac 100644
--- a/tests/pkg_fatfs_vfs/Makefile
+++ b/tests/pkg_fatfs_vfs/Makefile
@@ -6,6 +6,7 @@ FEATURES_REQUIRED += periph_spi
 
 # remove this if you don't want to format your SD card
 USEMODULE += fatfs_vfs_format
+CFLAGS += -DCONFIG_FATFS_FORMAT_ALLOC_STATIC=1
 
 FATFS_IMAGE_FILE_SIZE_MIB ?= 128