diff --git a/TESTS/mbed_hal/qspi/flash_configs/NORDIC/NRF52840_DK/flash_config.h b/TESTS/mbed_hal/qspi/flash_configs/NORDIC/NRF52840_DK/flash_config.h
index 73be2cd3a2..d47d1a47e3 100644
--- a/TESTS/mbed_hal/qspi/flash_configs/NORDIC/NRF52840_DK/flash_config.h
+++ b/TESTS/mbed_hal/qspi/flash_configs/NORDIC/NRF52840_DK/flash_config.h
@@ -29,4 +29,9 @@
 #undef QSPI_CMD_READ_1IO
 #define QSPI_CMD_READ_1IO                         QSPI_CMD_READ_1IO_FAST
 
+#ifdef QSPI_SECTOR_COUNT
+#undef QSPI_SECTOR_COUNT
+#define QSPI_SECTOR_COUNT                       2048 // for MX25R6435F
+#endif
+
 #endif // MBED_QSPI_FLASH_CONFIG_H
diff --git a/TESTS/mbed_hal/qspi/flash_configs/SiliconLabs/EFM32GG11_STK3701/flash_config.h b/TESTS/mbed_hal/qspi/flash_configs/SiliconLabs/EFM32GG11_STK3701/flash_config.h
index 41b576d8ea..58a9c1e626 100644
--- a/TESTS/mbed_hal/qspi/flash_configs/SiliconLabs/EFM32GG11_STK3701/flash_config.h
+++ b/TESTS/mbed_hal/qspi/flash_configs/SiliconLabs/EFM32GG11_STK3701/flash_config.h
@@ -18,5 +18,9 @@
 
 #include "../../MX25RXX35F_config.h"
 
+#ifdef QSPI_SECTOR_COUNT
+#undef QSPI_SECTOR_COUNT
+#define QSPI_SECTOR_COUNT                       1024 // for MX25R3235F
+#endif
 
 #endif // MBED_QSPI_FLASH_CONFIG_H