diff --git a/handmade.c b/handmade.c
index dcf1c73..f187d0d 100644
--- a/handmade.c
+++ b/handmade.c
@@ -2,7 +2,7 @@
 #include "handmade.h"
 #include "sdl_handmade.h"
 
-#include <math.h>
+#include "handmade_intrinsics.h"
 #include <string.h> /* memset */
 
 static void GameOutputSound(game_state *GameState,
@@ -51,18 +51,6 @@ static void ClearBackground(game_offscreen_buffer *Buffer)
     }
 }
 
-static S32 RoundF32toS32(F32 Real32)
-{
-    S32 Result = (S32)(Real32 + 0.5f);
-    return Result;
-}
-
-static S32 FloorF32toS32(F32 Real32)
-{
-    S32 Result = (S32)floorf(Real32);
-    return Result;
-}
-
 static void DrawRectangle(game_offscreen_buffer *Buffer,
                           F32 RealMinX, F32 RealMinY,
                           F32 RealMaxX, F32 RealMaxY,
diff --git a/handmade_intrinsics.h b/handmade_intrinsics.h
new file mode 100644
index 0000000..950a089
--- /dev/null
+++ b/handmade_intrinsics.h
@@ -0,0 +1,39 @@
+#ifndef HANDMADE_INTRINSICS_H_SENTRY
+#define HANDMADE_INTRINSICS_H_SENTRY
+
+/* TODO: Re-implement these functions so we do not have to rely on
+         math.h. */
+
+#include <math.h>
+
+S32 RoundF32toS32(F32 Real32)
+{
+    S32 Result = (S32)(Real32 + 0.5f);
+    return Result;
+}
+
+S32 FloorF32toS32(F32 Real32)
+{
+    S32 Result = (S32)floorf(Real32);
+    return Result;
+}
+
+F32 Sin(F32 Angle)
+{
+    F32 Result = sinf(Angle);
+    return Result;
+}
+
+F32 Cos(F32 Angle)
+{
+    F32 Result = cosf(Angle);
+    return Result;
+}
+
+F32 ATan2(F32 Y, F32 X)
+{
+    F32 Result = atan2f(Y, X);
+    return Result;
+}
+
+#endif
\ No newline at end of file