diff --git a/common.gypi b/common.gypi
index d2988d8c358081..7948f763e1f50b 100644
--- a/common.gypi
+++ b/common.gypi
@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.11',
+    'v8_embedder_string': '-node.12',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/compiler/backend/ppc/code-generator-ppc.cc b/deps/v8/src/compiler/backend/ppc/code-generator-ppc.cc
index 56c5003d2e8ede..ae8584ed304391 100644
--- a/deps/v8/src/compiler/backend/ppc/code-generator-ppc.cc
+++ b/deps/v8/src/compiler/backend/ppc/code-generator-ppc.cc
@@ -1515,12 +1515,14 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       }
       break;
     case kPPC_MulHigh32:
-      __ mulhw(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
-               i.OutputRCBit());
+      __ mulhw(r0, i.InputRegister(0), i.InputRegister(1), i.OutputRCBit());
+      // High 32 bits are undefined and need to be cleared.
+      __ clrldi(i.OutputRegister(), r0, Operand(32));
       break;
     case kPPC_MulHighU32:
-      __ mulhwu(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
-                i.OutputRCBit());
+      __ mulhwu(r0, i.InputRegister(0), i.InputRegister(1), i.OutputRCBit());
+      // High 32 bits are undefined and need to be cleared.
+      __ clrldi(i.OutputRegister(), r0, Operand(32));
       break;
     case kPPC_MulDouble:
       ASSEMBLE_FLOAT_BINOP_RC(fmul, MiscField::decode(instr->opcode()));