diff --git a/evm/src/cpu/kernel/asm/core/precompiles/rip160.asm b/evm/src/cpu/kernel/asm/core/precompiles/rip160.asm
index 8444088c..31cf8da1 100644
--- a/evm/src/cpu/kernel/asm/core/precompiles/rip160.asm
+++ b/evm/src/cpu/kernel/asm/core/precompiles/rip160.asm
@@ -27,7 +27,7 @@ global precompile_rip160:
     //
     //    %stack (ctx, size) ->
     //        (
-    //        0, @SEGMENT_KERNEL_GENERAL, 200, // DST
+    //        ctx, @SEGMENT_KERNEL_GENERAL, 200, // DST
     //        ctx, @SEGMENT_CALLDATA, 0,       // SRC
     //        size, ripemd,                    // count, retdest
     //        200, size, rip160_contd          // ripemd input: virt, num_bytes, retdest
@@ -42,7 +42,7 @@ global precompile_rip160:
     SWAP6
     PUSH 200
     PUSH @SEGMENT_KERNEL_GENERAL
-    PUSH 0
+    DUP3
 
     %jump(memcpy)
 
diff --git a/evm/src/cpu/kernel/asm/core/precompiles/sha256.asm b/evm/src/cpu/kernel/asm/core/precompiles/sha256.asm
index 61be27fc..8cdb8fee 100644
--- a/evm/src/cpu/kernel/asm/core/precompiles/sha256.asm
+++ b/evm/src/cpu/kernel/asm/core/precompiles/sha256.asm
@@ -31,7 +31,7 @@ global precompile_sha256:
     //
     //    %stack (ctx, size) ->
     //        (
-    //        0, @SEGMENT_KERNEL_GENERAL, 1, // DST
+    //        ctx, @SEGMENT_KERNEL_GENERAL, 1, // DST
     //        ctx, @SEGMENT_CALLDATA, 0,     // SRC
     //        size, sha2,                    // count, retdest
     //        0, size, sha256_contd          // sha2 input: virt, num_bytes, retdest
@@ -47,7 +47,7 @@ global precompile_sha256:
     SWAP6
     PUSH 1
     PUSH @SEGMENT_KERNEL_GENERAL
-    PUSH 0
+    DUP3
 
     %jump(memcpy)