diff --git a/ci/aarch64-openbsd-debug.sh b/ci/aarch64-openbsd-debug.sh
index fedf844537275581a98b0d174c0bfef16188ae3b..d8083e5a02969a01f78e72a453984cc033d1035c 100755
--- a/ci/aarch64-openbsd-debug.sh
+++ b/ci/aarch64-openbsd-debug.sh
@@ -50,6 +50,7 @@ stage3-debug/bin/zig build install test docs \
   -Duse-zig-libcxx \
   -Denable-llvm \
   -Dno-lib \
-  -Dskip-non-native
+  -Dskip-non-native \
+  -Dskip-single-threaded
 
 stage4-debug/bin/zig test ../test/behavior.zig
diff --git a/ci/aarch64-openbsd-release.sh b/ci/aarch64-openbsd-release.sh
index 06fdb646414085bcc62c4cf4bf6a8f7812601ddc..d04cd9f011ff25eeca9634f96ef8903bda77a062 100755
--- a/ci/aarch64-openbsd-release.sh
+++ b/ci/aarch64-openbsd-release.sh
@@ -52,7 +52,8 @@ stage3-release/bin/zig build install test docs \
   -Duse-zig-libcxx \
   -Denable-llvm \
   -Dno-lib \
-  -Dskip-non-native
+  -Dskip-non-native \
+  -Dskip-single-threaded
 
 # Ensure that the fuzzer at least compiles.
 # https://codeberg.org/ziglang/zig/issues/30728
diff --git a/ci/riscv64-linux-debug.sh b/ci/riscv64-linux-debug.sh
index c9ea9928f7244f4625374e84290c72dfa15e1af5..b9658a3a39ca317b03e6a9fbfe87986196b26dbb 100755
--- a/ci/riscv64-linux-debug.sh
+++ b/ci/riscv64-linux-debug.sh
@@ -50,6 +50,7 @@ stage3-debug/bin/zig build install test docs \
   -Duse-zig-libcxx \
   -Denable-llvm \
   -Dno-lib \
-  -Dskip-non-native
+  -Dskip-non-native \
+  -Dskip-single-threaded
 
 stage4-debug/bin/zig test ../test/behavior.zig
diff --git a/ci/riscv64-linux-release.sh b/ci/riscv64-linux-release.sh
index 63ab389bf9c5ab9ae8a41895edb81c4205f798c2..71bd1522e137b77d1443e13ffd5af9727dd35784 100755
--- a/ci/riscv64-linux-release.sh
+++ b/ci/riscv64-linux-release.sh
@@ -52,7 +52,8 @@ stage3-release/bin/zig build install test docs \
   -Duse-zig-libcxx \
   -Denable-llvm \
   -Dno-lib \
-  -Dskip-non-native
+  -Dskip-non-native \
+  -Dskip-single-threaded
 
 # Ensure that the fuzzer at least compiles.
 stage3-release/bin/zig build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=ReleaseSafe