diff --git a/src/vscp/common/vscp-bootdevice-vscp.h b/src/vscp/common/vscp-bootdevice-vscp.h
index 51fa6d862..5665039bc 100644
--- a/src/vscp/common/vscp-bootdevice-vscp.h
+++ b/src/vscp/common/vscp-bootdevice-vscp.h
@@ -41,11 +41,11 @@
 
 // This macro construct a signed long from four unsigned chars in a safe way
 #define construct_signed32(b0, b1, b2, b3)                                                                             \
-  ((int32_t) ((((uint32_t) b0) << 24) + (((uint32_t) b0) << 16) + (((uint32_t) b0) << 8) + (uint32_t) b0))
+  ((int32_t) ((((uint32_t) b0) << 24) + (((uint32_t) b1) << 16) + (((uint32_t) b2) << 8) + (uint32_t) b3))
 
 // This macro construct a unsigned long from four unsigned chars in a safe way
 #define construct_unsigned32(b0, b1, b2, b3)                                                                           \
-  ((uint32_t) ((((uint32_t) b0) << 24) + (((uint32_t) b0) << 16) + (((uint32_t) b0) << 8) + (uint32_t) b0))
+  ((uint32_t) ((((uint32_t) b0) << 24) + (((uint32_t) b1) << 16) + (((uint32_t) b1) << 8) + (uint32_t) b3))
 
 class CBootDevice_VSCP : public CBootDevice {
 public: