diff --git a/firmware/target/arm/rk27xx/ata-nand-rk27xx.c b/firmware/target/arm/rk27xx/ata-nand-rk27xx.c
index 54a1223cfc..74b468a851 100644
--- a/firmware/target/arm/rk27xx/ata-nand-rk27xx.c
+++ b/firmware/target/arm/rk27xx/ata-nand-rk27xx.c
@@ -29,6 +29,8 @@
 #include "ftl-target.h"
 #include "nand-target.h"
 
+uint32_t ftl_banks;
+const struct nand_device_info_type* ftl_nand_type;
 /* This file provides only STUBS for now */
 
 /** static, private data **/
diff --git a/firmware/target/arm/rk27xx/ftl-target.h b/firmware/target/arm/rk27xx/ftl-target.h
index ad4dc04db1..96dc4d06fa 100644
--- a/firmware/target/arm/rk27xx/ftl-target.h
+++ b/firmware/target/arm/rk27xx/ftl-target.h
@@ -31,10 +31,10 @@
 #endif
 
 /* Pointer to an info structure regarding the flash type used */
-const struct nand_device_info_type* ftl_nand_type;
+extern const struct nand_device_info_type* ftl_nand_type;
 
 /* Number of banks we detected a chip on */
-uint32_t ftl_banks;
+extern uint32_t ftl_banks;
 
 uint32_t ftl_init(void);
 uint32_t ftl_read(uint32_t sector, uint32_t count, void* buffer);