diff --git a/hbvm/src/vm/mod.rs b/hbvm/src/vm/mod.rs
index 872099c..7c3a50f 100644
--- a/hbvm/src/vm/mod.rs
+++ b/hbvm/src/vm/mod.rs
@@ -243,7 +243,7 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
                         )?;
                     }
                     BMC => {
-                        let ParamBBD(dst, src, count) = param!(self, ParamBBD);
+                        let ParamBBD(src, dst, count) = param!(self, ParamBBD);
                         self.memory.block_copy(
                             self.read_reg(src).as_u64(),
                             self.read_reg(dst).as_u64(),
@@ -252,7 +252,7 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
                         )?;
                     }
                     BRC => {
-                        let ParamBBB(dst, src, count) = param!(self, ParamBBB);
+                        let ParamBBB(src, dst, count) = param!(self, ParamBBB);
                         core::ptr::copy(
                             self.registers.get_unchecked(usize::from(src)),
                             self.registers.get_unchecked_mut(usize::from(dst)),
diff --git a/spec.md b/spec.md
index 4c64f26..b9adf17 100644
--- a/spec.md
+++ b/spec.md
@@ -153,7 +153,7 @@
 
 | Opcode | Name |              Action              |
 |:------:|:----:|:--------------------------------:|
-|   30   | BMC  | `[#0] ← [#1], copy imm #2 bytes` |
+|   30   | BMC  | `[#1] ← [#0], copy imm #2 bytes` |
 
 ### Register copy
 - Type BBB
@@ -161,7 +161,7 @@
 
 | Opcode | Name |              Action              |
 |:------:|:----:|:--------------------------------:|
-|   31   | BRC  | `#0 ← #1, copy imm #2 registers` |
+|   31   | BRC  | `#1 ← #0, copy imm #2 registers` |
 
 ## Control flow