diff --git a/src/wasm/baseline/ppc/liftoff-assembler-ppc.h b/src/wasm/baseline/ppc/liftoff-assembler-ppc.h
index 7a43ee4af9..37deee76fd 100644
--- a/src/wasm/baseline/ppc/liftoff-assembler-ppc.h
+++ b/src/wasm/baseline/ppc/liftoff-assembler-ppc.h
@@ -1222,6 +1222,11 @@ void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
   bailout(kSimd, "i8x16_shuffle");
 }
 
+void LiftoffAssembler::emit_i8x16_popcnt(LiftoffRegister dst,
+                                         LiftoffRegister src) {
+  bailout(kSimd, "i8x16.popcnt");
+}
+
 void LiftoffAssembler::emit_i8x16_splat(LiftoffRegister dst,
                                         LiftoffRegister src) {
   bailout(kUnsupportedArchitecture, "emit_i8x16splat");
diff --git a/src/wasm/baseline/s390/liftoff-assembler-s390.h b/src/wasm/baseline/s390/liftoff-assembler-s390.h
index aad1478551..f81adcc4b4 100644
--- a/src/wasm/baseline/s390/liftoff-assembler-s390.h
+++ b/src/wasm/baseline/s390/liftoff-assembler-s390.h
@@ -1791,6 +1791,11 @@ void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
   bailout(kSimd, "i8x16_shuffle");
 }
 
+void LiftoffAssembler::emit_i8x16_popcnt(LiftoffRegister dst,
+                                         LiftoffRegister src) {
+  bailout(kSimd, "i8x16.popcnt");
+}
+
 void LiftoffAssembler::emit_i8x16_splat(LiftoffRegister dst,
                                         LiftoffRegister src) {
   bailout(kUnsupportedArchitecture, "emit_i8x16splat");