diff --git a/components/storage/blockdevice/COMPONENT_QSPIF/QSPIFBlockDevice.h b/components/storage/blockdevice/COMPONENT_QSPIF/QSPIFBlockDevice.h
index aa0ff64623..e922ffece0 100644
--- a/components/storage/blockdevice/COMPONENT_QSPIF/QSPIFBlockDevice.h
+++ b/components/storage/blockdevice/COMPONENT_QSPIF/QSPIFBlockDevice.h
@@ -249,14 +249,6 @@ public:
     virtual const char *get_type() const;
 
 private:
-
-    // SFDP helpers
-    friend int mbed::sfdp_parse_headers(mbed::Callback<int(bd_addr_t, void *, bd_size_t)> sfdp_reader,
-                                        mbed::sfdp_hdr_info &hdr_info);
-
-    // Internal functions
-
-
     /********************************/
     /*   Different Device Csel Mgmt */
     /********************************/
@@ -334,9 +326,6 @@ private:
     // Enable QPI mode (4-4-4)
     int _sfdp_set_qpi_enabled(uint8_t *basic_param_table_ptr);
 
-    // Set Page size for program
-    int _sfdp_detect_page_size(uint8_t *basic_param_table_ptr, int basic_param_table_size);
-
     // Detect 4-byte addressing mode and enable it if supported
     int _sfdp_detect_and_enable_4byte_addressing(uint8_t *basic_param_table_ptr, int basic_param_table_size);
 
diff --git a/components/storage/blockdevice/COMPONENT_SPIF/SPIFBlockDevice.h b/components/storage/blockdevice/COMPONENT_SPIF/SPIFBlockDevice.h
index 8ea0bab8ed..061acb6fd8 100644
--- a/components/storage/blockdevice/COMPONENT_SPIF/SPIFBlockDevice.h
+++ b/components/storage/blockdevice/COMPONENT_SPIF/SPIFBlockDevice.h
@@ -217,13 +217,6 @@ public:
     virtual const char *get_type() const;
 
 private:
-
-    // Internal functions
-
-    // SFDP helpers
-    friend int mbed::sfdp_parse_headers(mbed::Callback<int(bd_addr_t, void *, bd_size_t)> sfdp_reader,
-                                        mbed::sfdp_hdr_info &hdr_info);
-
     /****************************************/
     /* SFDP Detection and Parsing Functions */
     /****************************************/
@@ -237,9 +230,6 @@ private:
     // Detect fastest read Bus mode supported by device
     int _sfdp_detect_best_bus_read_mode(uint8_t *basic_param_table_ptr, int basic_param_table_size, int &read_inst);
 
-    // Set Page size for program
-    unsigned int _sfdp_detect_page_size(uint8_t *basic_param_table_ptr, int basic_param_table_size);
-
     /***********************/
     /* Utilities Functions */
     /***********************/