diff --git a/src/SdlMutex.cpp b/src/SdlMutex.cpp
index 1ad5979..7163e55 100644
--- a/src/SdlMutex.cpp
+++ b/src/SdlMutex.cpp
@@ -1,5 +1,6 @@
 // This is copyrighted software. More information is at the end of this file.
 #include "SdlMutex.h"
+#include <stdexcept>
 
 SdlMutex::SdlMutex()
 {
@@ -7,6 +8,21 @@ SdlMutex::SdlMutex()
         throw std::runtime_error(SDL_GetError());
     }
 }
+
+void SdlMutex::lock()
+{
+    if (SDL_LockMutex(mutex_) != 0) {
+        throw std::runtime_error(SDL_GetError());
+    }
+}
+
+void SdlMutex::unlock()
+{
+    if (SDL_UnlockMutex(mutex_) != 0) {
+        throw std::runtime_error(SDL_GetError());
+    }
+}
+
 /*
 
 Copyright (C) 2021 Nikos Chantziaras.
diff --git a/src/SdlMutex.h b/src/SdlMutex.h
index 50c8613..0763bc4 100644
--- a/src/SdlMutex.h
+++ b/src/SdlMutex.h
@@ -3,7 +3,6 @@
 #include <SDL_error.h>
 #include <SDL_mutex.h>
 #include <SDL_version.h>
-#include <stdexcept>
 
 /*
  * RAII wrapper for SDL_mutex. Satisfies std's "Lockable" (SDL 2) or "BasicLockable" (SDL 1)
@@ -22,10 +21,7 @@ class SdlMutex final
     SdlMutex(const SdlMutex&) = delete;
     auto operator=(const SdlMutex&) -> SdlMutex& = delete;
 
-    void lock() noexcept
-    {
-        SDL_LockMutex(mutex_);
-    }
+    void lock();
 
 #if SDL_VERSION_ATLEAST(2, 0, 0)
     bool try_lock() noexcept
@@ -34,10 +30,7 @@ class SdlMutex final
     }
 #endif
 
-    void unlock() noexcept
-    {
-        SDL_UnlockMutex(mutex_);
-    }
+    void unlock();
 
 private:
     SDL_mutex* mutex_ = SDL_CreateMutex();