diff --git a/CMakeLists.txt b/CMakeLists.txt
index b4ef0e94d..1086ac30f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,9 +41,11 @@ message("Configuring for FLASH_MB_SIZE=${FLASH_MB_SIZE}MB")
 if(NOT DEFINED FLASH_MB_LIMIT_SIZE)
 	if(BOARD STREQUAL "PRALINE")
 		set(FLASH_MB_LIMIT_SIZE 3.5) #PRALINE 4 MB = 3.5 firmware + 0.5 MB fpga bitstream.
+		set(FLASH_MB_LIMIT_WITH_BITSTREAM_SIZE 4) #PRALINE 4 MB = 3.5 firmware + 0.5 MB fpga bitstream.
 	else()
 	    set(FLASH_MB_LIMIT_SIZE 1) #TODO: should be ${FLASH_MB_SIZE} remove once we got a stable build for all devices we support with bigger than 1 mb flash
-	endif()
+		set(FLASH_MB_LIMIT_WITH_BITSTREAM_SIZE 1) # the hackrf one ain't have bitstream. this is to satisfy the FLASH ERR checker.
+		endif()
 endif()
 message("Configuring for FLASH_MB_LIMIT_SIZE=${FLASH_MB_LIMIT_SIZE}MB")
 
diff --git a/firmware/application/ui_navigation.cpp b/firmware/application/ui_navigation.cpp
index 210a8fe3a..538d9c2f9 100644
--- a/firmware/application/ui_navigation.cpp
+++ b/firmware/application/ui_navigation.cpp
@@ -607,7 +607,7 @@ bool InformationView::firmware_checksum_error() {
 
     // only checking firmware checksum once per boot
     if (!fw_checksum_checked) {
-        fw_checksum_error = (simple_checksum(FLASH_STARTING_ADDRESS, FLASH_SIZE_LIMIT_MB * 1024 * 1024) != FLASH_EXPECTED_CHECKSUM);
+        fw_checksum_error = (simple_checksum(FLASH_STARTING_ADDRESS, FLASH_SIZE_LIMIT_WITH_BITSTREAM_MB * 1024 * 1024) != FLASH_EXPECTED_CHECKSUM);
     }
     return fw_checksum_error;
 }
diff --git a/flashsize.h.in b/flashsize.h.in
index a35ea111c..bc0d52313 100644
--- a/flashsize.h.in
+++ b/flashsize.h.in
@@ -6,4 +6,6 @@
 #define FLASH_SIZE_MB @FLASH_MB_SIZE@
 //Current compiled fw size in MB
 #define FLASH_SIZE_LIMIT_MB @FLASH_MB_LIMIT_SIZE@
+//Current compiled fw + bitstream size in MB
+#define FLASH_SIZE_LIMIT_WITH_BITSTREAM_MB @FLASH_MB_LIMIT_WITH_BITSTREAM_SIZE@
 // clang-format on
\ No newline at end of file