diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 667777c..a62b353 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,18 +24,6 @@ jobs:
       - run: |
           export PG_CONFIG=`which pg_config`
           sudo --preserve-env=PG_CONFIG make install
-  mac:
-    runs-on: macos-latest
-    if: ${{ !startsWith(github.ref_name, 'windows') }}
-    steps:
-      - uses: actions/checkout@v4
-      - uses: ankane/setup-postgres@v1
-        with:
-          postgres-version: 14
-      - run: make
-        env:
-          PG_CFLAGS: -DUSE_ASSERT_CHECKING -Wall -Wextra -Werror -Wno-unused-parameter
-      - run: make install
   windows:
     runs-on: windows-latest
     if: ${{ !startsWith(github.ref_name, 'mac') }}
@@ -70,14 +58,3 @@ jobs:
           make
         env:
           PG_CFLAGS: -DUSE_ASSERT_CHECKING -Wall -Wextra -Werror -Wno-unused-parameter -Wno-sign-compare
-  valgrind:
-    if: ${{ !startsWith(github.ref_name, 'mac') && !startsWith(github.ref_name, 'windows') }}
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: ankane/setup-postgres-valgrind@v1
-        with:
-          postgres-version: 16
-      - run: make
-      - run: sudo --preserve-env=PG_CONFIG make install
-      - run: make installcheck
diff --git a/src/halfvec.h b/src/halfvec.h
index ebb9046..f034bff 100644
--- a/src/halfvec.h
+++ b/src/halfvec.h
@@ -7,8 +7,6 @@
 
 #ifdef __FLT16_MAX__
 #define FLT16_SUPPORT
-#else
-#error "_Float16 not supported"
 #endif
 
 #ifdef FLT16_SUPPORT
@@ -16,7 +14,7 @@
 #define HALF_MAX FLT16_MAX
 #else
 /* TODO #pragma message("")? */
-#define half uint16
+#define half __fp16
 #define HALF_MAX 65504
 #endif