diff --git a/ci/aarch64-macos-release.sh b/ci/aarch64-macos-release.sh
index 2c3f377fed..e22b9ab9a0 100755
--- a/ci/aarch64-macos-release.sh
+++ b/ci/aarch64-macos-release.sh
@@ -51,6 +51,10 @@ stage3-release/bin/zig build test docs \
   --search-prefix "$PREFIX" \
   --test-timeout 2m
 
+# Ensure that the fuzzer at least compiles.
+stage3-release/bin/zig build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=ReleaseSafe
+stage3-release/bin/zig build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=Debug
+
 # Ensure that stage3 and stage4 are byte-for-byte identical.
 stage3-release/bin/zig build \
   --maxrss ${ZSF_MAX_RSS:-0} \
diff --git a/ci/x86_64-linux-release.sh b/ci/x86_64-linux-release.sh
index 2ea3ea89ee..b5701a1c93 100755
--- a/ci/x86_64-linux-release.sh
+++ b/ci/x86_64-linux-release.sh
@@ -51,7 +51,10 @@ unset CXX
 
 ninja install
 
-# simultaneously test building self-hosted without LLVM and with 32-bit arm
+# Covers several things:
+# 1. building the compiler without LLVM
+# 2. 32-bit
+# 3. arm
 stage3-release/bin/zig build \
   -Dtarget=arm-linux-musleabihf \
   -Dno-lib
@@ -70,6 +73,10 @@ stage3-release/bin/zig build test docs \
   -Denable-superhtml \
   --test-timeout 12m
 
+# Ensure that the fuzzer at least compiles.
+stage3-release/bin/zig build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=ReleaseSafe
+stage3-release/bin/zig build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=Debug
+
 # Ensure that stage3 and stage4 are byte-for-byte identical.
 stage3-release/bin/zig build \
   --prefix stage4-release \
diff --git a/ci/x86_64-windows-release.ps1 b/ci/x86_64-windows-release.ps1
index 38458c9883..7a606dbac4 100644
--- a/ci/x86_64-windows-release.ps1
+++ b/ci/x86_64-windows-release.ps1
@@ -54,6 +54,13 @@ stage3-release\bin\zig.exe build test docs `
   --test-timeout 30m
 CheckLastExitCode
 
+# Ensure that the fuzzer at least compiles.
+# https://codeberg.org/ziglang/zig/issues/31893
+# stage3-release\bin\zig.exe build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=ReleaseSafe
+# CheckLastExitCode
+# stage3-release\bin\zig.exe build test-std --fuzz=1K -Dno-lib -Dfuzz-only -Doptimize=Debug
+# CheckLastExitCode
+
 # Ensure that stage3 and stage4 are byte-for-byte identical.
 Write-Output "Build and compare stage4..."
 stage3-release\bin\zig.exe build `