diff --git a/src/tint/sem/bool_type.cc b/src/tint/sem/bool_type.cc
index c8027a4..d42f687 100644
--- a/src/tint/sem/bool_type.cc
+++ b/src/tint/sem/bool_type.cc
@@ -28,7 +28,7 @@
 Bool::~Bool() = default;
 
 size_t Bool::Hash() const {
-  return TypeInfo::Of<Bool>().full_hashcode;
+  return static_cast<size_t>(TypeInfo::Of<Bool>().full_hashcode);
 }
 
 bool Bool::Equals(const Type& other) const {
diff --git a/src/tint/sem/external_texture_type.cc b/src/tint/sem/external_texture_type.cc
index 1abe825..885bbae 100644
--- a/src/tint/sem/external_texture_type.cc
+++ b/src/tint/sem/external_texture_type.cc
@@ -28,7 +28,7 @@
 ExternalTexture::~ExternalTexture() = default;
 
 size_t ExternalTexture::Hash() const {
-  return TypeInfo::Of<ExternalTexture>().full_hashcode;
+  return static_cast<size_t>(TypeInfo::Of<ExternalTexture>().full_hashcode);
 }
 
 bool ExternalTexture::Equals(const sem::Type& other) const {
diff --git a/src/tint/sem/f32_type.cc b/src/tint/sem/f32_type.cc
index 62b964d..2e666d5 100644
--- a/src/tint/sem/f32_type.cc
+++ b/src/tint/sem/f32_type.cc
@@ -28,7 +28,7 @@
 F32::~F32() = default;
 
 size_t F32::Hash() const {
-  return TypeInfo::Of<F32>().full_hashcode;
+  return static_cast<size_t>(TypeInfo::Of<F32>().full_hashcode);
 }
 
 bool F32::Equals(const Type& other) const {
diff --git a/src/tint/sem/i32_type.cc b/src/tint/sem/i32_type.cc
index 4631513..47cd5a6 100644
--- a/src/tint/sem/i32_type.cc
+++ b/src/tint/sem/i32_type.cc
@@ -28,7 +28,7 @@
 I32::~I32() = default;
 
 size_t I32::Hash() const {
-  return TypeInfo::Of<I32>().full_hashcode;
+  return static_cast<size_t>(TypeInfo::Of<I32>().full_hashcode);
 }
 
 bool I32::Equals(const Type& other) const {
diff --git a/src/tint/sem/u32_type.cc b/src/tint/sem/u32_type.cc
index 60bff9d..1580148 100644
--- a/src/tint/sem/u32_type.cc
+++ b/src/tint/sem/u32_type.cc
@@ -28,7 +28,7 @@
 U32::U32(U32&&) = default;
 
 size_t U32::Hash() const {
-  return TypeInfo::Of<U32>().full_hashcode;
+  return static_cast<size_t>(TypeInfo::Of<U32>().full_hashcode);
 }
 
 bool U32::Equals(const Type& other) const {
diff --git a/src/tint/sem/void_type.cc b/src/tint/sem/void_type.cc
index ff7e79e..e366e81 100644
--- a/src/tint/sem/void_type.cc
+++ b/src/tint/sem/void_type.cc
@@ -28,7 +28,7 @@
 Void::~Void() = default;
 
 size_t Void::Hash() const {
-  return TypeInfo::Of<Void>().full_hashcode;
+  return static_cast<size_t>(TypeInfo::Of<Void>().full_hashcode);
 }
 
 bool Void::Equals(const Type& other) const {