diff --git a/src/internal/fuzz/counters_supported.go b/src/internal/fuzz/counters_supported.go
index 79e27d27e1..a71d98d266 100644
--- a/src/internal/fuzz/counters_supported.go
+++ b/src/internal/fuzz/counters_supported.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (darwin || linux || windows || freebsd) && (amd64 || arm64)
+//go:build (darwin || linux || windows || freebsd || openbsd) && (amd64 || arm64)
 
 package fuzz
 
diff --git a/src/internal/fuzz/counters_unsupported.go b/src/internal/fuzz/counters_unsupported.go
index 287bb4bd3c..156919ec2e 100644
--- a/src/internal/fuzz/counters_unsupported.go
+++ b/src/internal/fuzz/counters_unsupported.go
@@ -8,7 +8,7 @@
 //
 // If you update this constraint, also update internal/platform.FuzzInstrumented.
 //
-//go:build !((darwin || linux || windows || freebsd) && (amd64 || arm64))
+//go:build !((darwin || linux || windows || freebsd || openbsd) && (amd64 || arm64))
 
 package fuzz
 
diff --git a/src/internal/fuzz/minimize_test.go b/src/internal/fuzz/minimize_test.go
index 2db2633896..e7e23e5a05 100644
--- a/src/internal/fuzz/minimize_test.go
+++ b/src/internal/fuzz/minimize_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || freebsd || linux || windows
+//go:build darwin || freebsd || linux || openbsd || windows
 
 package fuzz
 
diff --git a/src/internal/fuzz/sys_posix.go b/src/internal/fuzz/sys_posix.go
index fec6054f67..40d3771c2a 100644
--- a/src/internal/fuzz/sys_posix.go
+++ b/src/internal/fuzz/sys_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || freebsd || linux
+//go:build darwin || freebsd || linux || openbsd
 
 package fuzz
 
diff --git a/src/internal/fuzz/sys_unimplemented.go b/src/internal/fuzz/sys_unimplemented.go
index 8687c1f963..30766ba525 100644
--- a/src/internal/fuzz/sys_unimplemented.go
+++ b/src/internal/fuzz/sys_unimplemented.go
@@ -4,7 +4,7 @@
 
 // If you update this constraint, also update internal/platform.FuzzSupported.
 //
-//go:build !darwin && !freebsd && !linux && !windows
+//go:build !darwin && !freebsd && !linux && !openbsd && !windows
 
 package fuzz
 
diff --git a/src/internal/platform/supported.go b/src/internal/platform/supported.go
index 702a255e4c..ad8dc93086 100644
--- a/src/internal/platform/supported.go
+++ b/src/internal/platform/supported.go
@@ -61,7 +61,7 @@ func ASanSupported(goos, goarch string) bool {
 // ('go test -fuzz=.').
 func FuzzSupported(goos, goarch string) bool {
 	switch goos {
-	case "darwin", "freebsd", "linux", "windows":
+	case "darwin", "freebsd", "linux", "openbsd", "windows":
 		return true
 	default:
 		return false