diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index dfacf4c2a7..24ebbc5c15 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -5159,6 +5159,8 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
       } else {
         mode = NUMBER_CANDIDATE_IS_SMI;
       }
+    } else {
+      mode = NUMBER_CANDIDATE_IS_SMI;
     }
   }
 
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 4318f31689..13f17fddac 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -5510,6 +5510,8 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
       } else {
         mode = NUMBER_CANDIDATE_IS_SMI;
       }
+    } else {
+      mode = NUMBER_CANDIDATE_IS_SMI;
     }
   }
 
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 301ceba1b1..c5027070f0 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4855,6 +4855,8 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
       } else {
         mode = NUMBER_CANDIDATE_IS_SMI;
       }
+    } else {
+      mode = NUMBER_CANDIDATE_IS_SMI;
     }
   }
 
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 61eb7d13c1..7ced99c26c 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -4803,6 +4803,8 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
       } else {
         mode = NUMBER_CANDIDATE_IS_SMI;
       }
+    } else {
+      mode = NUMBER_CANDIDATE_IS_SMI;
     }
   }