diff --git a/API/hermes/hermes.cpp b/API/hermes/hermes.cpp
index 49324d2364a..cb2074cd26e 100644
--- a/API/hermes/hermes.cpp
+++ b/API/hermes/hermes.cpp
@@ -927,7 +927,7 @@ class HermesRuntimeImpl final : public HermesRuntime,
       return value_;
     }
 
-    void invalidate() override {
+    void invalidate() noexcept override {
 #ifdef ASSERT_ON_DANGLING_VM_REFS
       assert(
           ((1u << 31) & refCount_) == 0 &&
@@ -936,7 +936,7 @@ class HermesRuntimeImpl final : public HermesRuntime,
       dec();
     }
 
-    void inc() {
+    void inc() noexcept {
       // It is always safe to use relaxed operations for incrementing the
       // reference count, because the only operation that may occur concurrently
       // with it is decrementing the reference count, and we do not need to
@@ -947,7 +947,7 @@ class HermesRuntimeImpl final : public HermesRuntime,
       (void)oldCount;
     }
 
-    void dec() {
+    void dec() noexcept {
       // It is safe to use relaxed operations here because decrementing the
       // reference count is the only access that may be performed without proper
       // synchronisation. As a result, the only ordering we need to enforce when
diff --git a/API/hermes_abi/HermesABIRuntimeWrapper.cpp b/API/hermes_abi/HermesABIRuntimeWrapper.cpp
index cf1776fed57..405d1af5672 100644
--- a/API/hermes_abi/HermesABIRuntimeWrapper.cpp
+++ b/API/hermes_abi/HermesABIRuntimeWrapper.cpp
@@ -189,11 +189,11 @@ class HermesABIRuntimeWrapper : public Runtime {
       return managedPointer_;
     }
 
-    void invalidate() override {
+    void invalidate() noexcept override {
       dec();
     }
 
-    void inc() {
+    void inc() noexcept {
       // See comments in hermes_abi.cpp for why we use relaxed operations here.
       auto oldCount = refCount_.fetch_add(1, std::memory_order_relaxed);
       assert(oldCount && "Cannot resurrect a pointer");
@@ -201,7 +201,7 @@ class HermesABIRuntimeWrapper : public Runtime {
       (void)oldCount;
     }
 
-    void dec() {
+    void dec() noexcept {
       // See comments in hermes_abi.cpp for why we use relaxed operations here.
       auto oldCount = refCount_.fetch_sub(1, std::memory_order_relaxed);
       assert(oldCount > 0 && "Ref count underflow");
diff --git a/API/hermes_sandbox/HermesSandboxRuntime.cpp b/API/hermes_sandbox/HermesSandboxRuntime.cpp
index 181d129c852..ded57ed162b 100644
--- a/API/hermes_sandbox/HermesSandboxRuntime.cpp
+++ b/API/hermes_sandbox/HermesSandboxRuntime.cpp
@@ -1048,11 +1048,11 @@ class HermesSandboxRuntimeImpl : public facebook::hermes::HermesSandboxRuntime,
       return managedPointer_;
     }
 
-    void invalidate() override {
+    void invalidate() noexcept override {
       dec();
     }
 
-    void inc() {
+    void inc() noexcept {
       // See comments in hermes_vtable.cpp for why we use relaxed operations
       // here.
       auto oldCount = refCount_.fetch_add(1, std::memory_order_relaxed);
@@ -1061,7 +1061,7 @@ class HermesSandboxRuntimeImpl : public facebook::hermes::HermesSandboxRuntime,
       (void)oldCount;
     }
 
-    void dec() {
+    void dec() noexcept {
       // See comments in hermes_vtable.cpp for why we use relaxed operations
       // here, and why TSAN requires different ordering.
 
diff --git a/API/jsi/jsi/jsi.h b/API/jsi/jsi/jsi.h
index 07e3722cb0e..a826923a640 100644
--- a/API/jsi/jsi/jsi.h
+++ b/API/jsi/jsi/jsi.h
@@ -288,7 +288,7 @@ class JSI_EXPORT Runtime {
   // rvalue arguments/methods would also reduce the number of clones.
 
   struct PointerValue {
-    virtual void invalidate() = 0;
+    virtual void invalidate() noexcept = 0;
 
    protected:
     virtual ~PointerValue() = default;