diff --git a/Libraries/LibCore/System.cpp b/Libraries/LibCore/System.cpp
index 4d6d65f4dc6..586a3a9070c 100644
--- a/Libraries/LibCore/System.cpp
+++ b/Libraries/LibCore/System.cpp
@@ -1010,4 +1010,11 @@ bool is_socket(int fd)
     return !result.is_error() && S_ISSOCK(result.value().st_mode);
 }
 
+ErrorOr<void> sleep_ms(u32 milliseconds)
+{
+    if (usleep(1000 * milliseconds) != 0)
+        return Error::from_syscall("usleep"sv, -errno);
+    return {};
+}
+
 }
diff --git a/Libraries/LibCore/System.h b/Libraries/LibCore/System.h
index 06b11979994..ee195dc3806 100644
--- a/Libraries/LibCore/System.h
+++ b/Libraries/LibCore/System.h
@@ -181,5 +181,6 @@ ErrorOr<void> set_resource_limits(int resource, rlim_t limit);
 
 int getpid();
 bool is_socket(int fd);
+ErrorOr<void> sleep_ms(u32 milliseconds);
 
 }
diff --git a/Libraries/LibCore/SystemWindows.cpp b/Libraries/LibCore/SystemWindows.cpp
index 519c236bfcf..21f857e6c52 100644
--- a/Libraries/LibCore/SystemWindows.cpp
+++ b/Libraries/LibCore/SystemWindows.cpp
@@ -225,4 +225,10 @@ bool is_socket(int handle)
     return GetFileType(to_handle(handle)) == FILE_TYPE_PIPE;
 }
 
+ErrorOr<void> sleep_ms(u32 milliseconds)
+{
+    Sleep(milliseconds);
+    return {};
+}
+
 }