diff --git a/.github/workflows/cibuildwheel.yml b/.github/workflows/cibuildwheel.yml
index d478fb6..fecc3d3 100644
--- a/.github/workflows/cibuildwheel.yml
+++ b/.github/workflows/cibuildwheel.yml
@@ -17,6 +17,7 @@ jobs:
     name: Build wheels on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-20.04, windows-2019, macos-11]
 
diff --git a/src/healpix.c b/src/healpix.c
index ac42bba..ea8c685 100644
--- a/src/healpix.c
+++ b/src/healpix.c
@@ -29,7 +29,7 @@ static double invz(double z, double s) {
 static inline int clz(uint64_t x) {
 #if defined(__GNUC__) || defined(__clang__)
     return __builtin_clzll(x);
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_X64))
     unsigned long bsr;
     return _BitScanReverse64(&bsr, x) ? 63 - bsr : 64;
 #else