diff --git a/go-pathrs/internal/libpathrs/libpathrs_linux.go b/go-pathrs/internal/libpathrs/libpathrs_linux.go
index d610a3be..cceb20c0 100644
--- a/go-pathrs/internal/libpathrs/libpathrs_linux.go
+++ b/go-pathrs/internal/libpathrs/libpathrs_linux.go
@@ -217,7 +217,15 @@ func InRootHardlink(oldRootFd uintptr, oldPath string, newRootFd uintptr, newPat
 }
 
 // ProcBase is pathrs_proc_base_t (uint64_t).
-type ProcBase C.pathrs_proc_base_t
+//
+// Spelled out rather than taken from C.pathrs_proc_base_t, because cbindgen
+// since v0.29.3 emits the C23 fixed-type enum syntax for pathrs_proc_base_t,
+// and in C23 mode that makes the typedef name the enum rather than uint64_t.
+// CGo maps a C enum to a *signed* Go type, so none of the constants below fit
+// in it and the package stops compiling. Every compiler defaulting to C23
+// (gcc >= 15) is affected. The values are converted back at each call site
+// anyway, so nothing else has to know which spelling the header uses.
+type ProcBase uint64
 
 // FIXME: We need to open-code the constants because CGo unfortunately will
 // implicitly convert any non-literal constants (i.e. those resolved using gcc)