diff --git a/ReactCommon/React-Fabric.podspec b/ReactCommon/React-Fabric.podspec
index ee46e5f291b..e439a5d7e63 100644
--- a/ReactCommon/React-Fabric.podspec
+++ b/ReactCommon/React-Fabric.podspec
@@ -235,8 +235,7 @@ Pod::Spec.new do |s|
   s.subspec "debug_core" do |ss|
     ss.dependency             folly_dep_name, folly_version
     ss.compiler_flags       = folly_compiler_flags
-    ss.source_files         = "react/debug/*.h",
-                              "react/debug/ios/**/*.{m,mm,cpp,h}"
+    ss.source_files         = "react/debug/**/*.{m,mm,cpp,h}"
     ss.exclude_files        = "react/debug/tests"
     ss.header_dir           = "react/debug"
   end
diff --git a/ReactCommon/react/debug/BUCK b/ReactCommon/react/debug/BUCK
index ef141d97dd0..20c7a930f8c 100644
--- a/ReactCommon/react/debug/BUCK
+++ b/ReactCommon/react/debug/BUCK
@@ -14,6 +14,10 @@ APPLE_COMPILER_FLAGS = get_apple_compiler_flags()
 
 rn_xplat_cxx_library(
     name = "debug",
+    srcs = glob(
+        ["**/*.cpp"],
+        exclude = glob(["tests/**/*.cpp"]),
+    ),
     headers = glob(
         ["**/*.h"],
         exclude = glob(["tests/**/*.h"]),
@@ -36,10 +40,8 @@ rn_xplat_cxx_library(
         # for android react_native_assert
         "-llog",
     ],
-    fbandroid_srcs = glob(["android/**/*.cpp"]),
     fbobjc_compiler_flags = APPLE_COMPILER_FLAGS,
     fbobjc_preprocessor_flags = get_preprocessor_flags_for_build_mode() + get_apple_inspector_flags(),
-    fbobjc_srcs = glob(["ios/**/*.mm"]),
     force_static = True,
     labels = [
         "pfh:ReactNative_CommonInfrastructurePlaceholder",
diff --git a/ReactCommon/react/debug/CMakeLists.txt b/ReactCommon/react/debug/CMakeLists.txt
index a985ac20a1c..ccfc69872e7 100644
--- a/ReactCommon/react/debug/CMakeLists.txt
+++ b/ReactCommon/react/debug/CMakeLists.txt
@@ -16,7 +16,7 @@ add_compile_options(
         -DLOG_TAG=\"Fabric\")
 
 
-file(GLOB react_debug_SRC CONFIGURE_DEPENDS android/*.cpp)
+file(GLOB react_debug_SRC CONFIGURE_DEPENDS *.cpp)
 add_library(react_debug SHARED ${react_debug_SRC})
 
 target_include_directories(react_debug PUBLIC ${REACT_COMMON_DIR})
diff --git a/ReactCommon/react/debug/ios/react_native_assert.mm b/ReactCommon/react/debug/ios/react_native_assert.mm
deleted file mode 100644
index ad9397e37e2..00000000000
--- a/ReactCommon/react/debug/ios/react_native_assert.mm
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#import <Foundation/NSException.h>
-#import <glog/logging.h>
-#import <react/debug/react_native_assert.h>
-
-#ifdef REACT_NATIVE_DEBUG
-
-extern "C" void react_native_assert_fail(const char *func, const char *file, int line, const char *expr)
-{
-  // flush logs because some might be lost on iOS if an assert is hit right after
-  // this. If you are trying to debug something actively and have added lots of
-  // LOG statements to track down an issue, there is race between flushing the
-  // final logs and stopping execution when the assert hits. Thus, if we know an
-  // assert will fail, we force flushing to happen right before the assert.
-  LOG(ERROR) << "react_native_assert failure: " << expr;
-  google::FlushLogFiles(google::GLOG_INFO /*min_severity*/);
-
-  NSCAssert(false, @"%s:%d: function %s: assertion failed (%s)", file, line, func, expr);
-}
-
-#endif
diff --git a/ReactCommon/react/debug/android/react_native_assert.cpp b/ReactCommon/react/debug/react_native_assert.cpp
similarity index 76%
rename from ReactCommon/react/debug/android/react_native_assert.cpp
rename to ReactCommon/react/debug/react_native_assert.cpp
index 0c7c558ecc7..abcdc5e8fbc 100644
--- a/ReactCommon/react/debug/android/react_native_assert.cpp
+++ b/ReactCommon/react/debug/react_native_assert.cpp
@@ -5,10 +5,17 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#include <android/log.h>
-#include <react/debug/react_native_assert.h>
+#ifdef __ANDROID__
 
-#ifdef REACT_NATIVE_DEBUG
+#include <android/log.h>
+
+// Provide a prototype to silence missing prototype warning in release
+// mode.
+extern "C" void react_native_assert_fail(
+    const char *func,
+    const char *file,
+    int line,
+    const char *expr);
 
 extern "C" void react_native_assert_fail(
     const char *func,
@@ -35,4 +42,4 @@ extern "C" void react_native_assert_fail(
       expr);
 }
 
-#endif
+#endif // __ANDROID__
diff --git a/ReactCommon/react/debug/react_native_assert.h b/ReactCommon/react/debug/react_native_assert.h
index 57eda382cb9..9ee5ce631c3 100644
--- a/ReactCommon/react/debug/react_native_assert.h
+++ b/ReactCommon/react/debug/react_native_assert.h
@@ -28,8 +28,9 @@
 
 #else // REACT_NATIVE_DEBUG
 
-#define react_native_assert(e) \
-  ((e) ? (void)0 : react_native_assert_fail(__func__, __FILE__, __LINE__, #e))
+#ifdef __ANDROID__
+
+#include <android/log.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -43,4 +44,27 @@ void react_native_assert_fail(
 }
 #endif // __cpusplus
 
+#define react_native_assert(e) \
+  ((e) ? (void)0 : react_native_assert_fail(__func__, __FILE__, __LINE__, #e))
+
+#else // __ANDROID__
+
+#include <glog/logging.h>
+#include <cassert>
+
+// For all platforms, but iOS+Xcode especially: flush logs because some might be
+// lost on iOS if an assert is hit right after this. If you are trying to debug
+// something actively and have added lots of LOG statements to track down an
+// issue, there is race between flushing the final logs and stopping execution
+// when the assert hits. Thus, if we know an assert will fail, we force flushing
+// to happen right before the assert.
+#define react_native_assert(cond)                           \
+  if (!(cond)) {                                            \
+    LOG(ERROR) << "react_native_assert failure: " << #cond; \
+    google::FlushLogFiles(google::GLOG_INFO);               \
+    assert(cond);                                           \
+  }
+
+#endif // platforms besides __ANDROID__
+
 #endif // REACT_NATIVE_DEBUG