diff --git a/src_c/simd_fill.h b/src_c/simd_fill.h
index c6799df214..36d98afb09 100644
--- a/src_c/simd_fill.h
+++ b/src_c/simd_fill.h
@@ -1,18 +1,10 @@
 #define NO_PYGAME_C_API
 #include "_surface.h"
 
-#if !defined(PG_ENABLE_ARM_NEON) && defined(__aarch64__)
-// arm64 has neon optimisations enabled by default, even when fpu=neon is not
-// passed
-#define PG_ENABLE_ARM_NEON 1
-#endif
-
 int
 _pg_has_avx2();
 
 // SSE2 functions
-#if defined(__SSE2__) || defined(PG_ENABLE_ARM_NEON)
-#endif /* (defined(__SSE2__) || defined(PG_ENABLE_ARM_NEON)) */
 
 // AVX2 functions
 int
diff --git a/src_c/simd_surface_fill_sse2.c b/src_c/simd_surface_fill_sse2.c
deleted file mode 100644
index d54452bfe6..0000000000
--- a/src_c/simd_surface_fill_sse2.c
+++ /dev/null
@@ -1,36 +0,0 @@
-#include "simd_fill.h"
-
-#if PG_ENABLE_ARM_NEON
-// sse2neon.h is from here: https://github.com/DLTcollab/sse2neon
-#include "include/sse2neon.h"
-#endif /* PG_ENABLE_ARM_NEON */
-
-/* This returns 1 when sse2 is available at runtime but support for it isn't
- * compiled in, 0 in all other cases */
-int
-pg_sse2_at_runtime_but_uncompiled()
-{
-    if (SDL_HasSSE2()) {
-#ifdef __SSE2__
-        return 0;
-#else
-        return 1;
-#endif /* __SSE2__ */
-    }
-    return 0;
-}
-
-/* This returns 1 when neon is available at runtime but support for it isn't
- * compiled in, 0 in all other cases */
-int
-pg_neon_at_runtime_but_uncompiled()
-{
-    if (SDL_HasNEON()) {
-#if PG_ENABLE_ARM_NEON
-        return 0;
-#else
-        return 1;
-#endif /* PG_ENABLE_ARM_NEON */
-    }
-    return 0;
-}
\ No newline at end of file