diff --git a/src/pixie/simd/avx.nim b/src/pixie/simd/avx.nim
index dfcd9cf..6d30b95 100644
--- a/src/pixie/simd/avx.nim
+++ b/src/pixie/simd/avx.nim
@@ -1,7 +1,7 @@
 import chroma, nimsimd/hassimd, nimsimd/avx
 
 when defined(gcc) or defined(clang):
-  {.localPassc: "-mavx".}
+  {.localPassC: "-mavx".}
 
 when defined(release):
   {.push checks: off.}
diff --git a/src/pixie/simd/avx2.nim b/src/pixie/simd/avx2.nim
index 9a02657..f6b02ef 100644
--- a/src/pixie/simd/avx2.nim
+++ b/src/pixie/simd/avx2.nim
@@ -1,7 +1,7 @@
 import avx, chroma, nimsimd/hassimd, nimsimd/avx2, pixie/blends, pixie/common, vmath
 
 when defined(gcc) or defined(clang):
-  {.localPassc: "-mavx2".}
+  {.localPassC: "-mavx2".}
 
 when defined(release):
   {.push checks: off.}