diff --git a/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.cpp b/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.cpp
index 20925ae807..710a6836f1 100644
--- a/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.cpp
+++ b/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.cpp
@@ -193,7 +193,7 @@ void setNewJavaException(jclass exceptionClass, const char* fmt, ARGS... args) {
   JNIEnv* env = internal::getEnv();
 
   try {
-    char *msg = (char*) alloca(msgSize);
+    char *msg = (char*) alloca(msgSize + 1);
     snprintf(msg, kMaxExceptionMessageBufferSize, fmt, args...);
     env->ThrowNew(exceptionClass, msg);
   } catch (...) {
diff --git a/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.h b/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.h
index 9ba9367f67..1892fd49c8 100644
--- a/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.h
+++ b/ReactAndroid/src/main/jni/first-party/jni/fbjni/Exceptions.h
@@ -114,7 +114,7 @@ template<typename... Args>
   assertIfExceptionsNotInitialized();
   int msgSize = snprintf(nullptr, 0, fmt, args...);
 
-  char *msg = (char*) alloca(msgSize);
+  char *msg = (char*) alloca(msgSize + 1);
   snprintf(msg, kMaxExceptionMessageBufferSize, fmt, args...);
   throwNewJavaException(throwableName, msg);
 }