diff --git a/lib/libprocstat/libprocstat.h b/lib/libprocstat/libprocstat.h
--- a/lib/libprocstat/libprocstat.h
+++ b/lib/libprocstat/libprocstat.h
@@ -102,6 +102,11 @@
 #define	PS_FST_FFLAG_EXEC	0x2000
 #define	PS_FST_FFLAG_HASLOCK	0x4000
 
+#if !defined(__ILP32__) && !defined(__riscv)
+/* Target architecture supports 32-bit compat */
+#define	PS_ARCH_HAS_FREEBSD32	1
+#endif
+
 struct kinfo_kstack;
 struct kinfo_proc;
 struct kinfo_vmentry;
diff --git a/lib/libprocstat/libprocstat.c b/lib/libprocstat/libprocstat.c
--- a/lib/libprocstat/libprocstat.c
+++ b/lib/libprocstat/libprocstat.c
@@ -2381,7 +2381,7 @@
 
 #define PROC_AUXV_MAX	256
 
-#if __ELF_WORD_SIZE == 64
+#ifdef PS_ARCH_HAS_FREEBSD32
 static const char *elf32_sv_names[] = {
 	"Linux ELF32",
 	"FreeBSD ELF32",
@@ -2464,7 +2464,7 @@
 	free(auxv32);
 	return (auxv);
 }
-#endif /* __ELF_WORD_SIZE == 64 */
+#endif /* PS_ARCH_HAS_FREEBSD32 */
 
 static Elf_Auxinfo *
 procstat_getauxv_sysctl(pid_t pid, unsigned int *cntp)
@@ -2473,7 +2473,7 @@
 	int name[4];
 	size_t len;
 
-#if __ELF_WORD_SIZE == 64
+#ifdef PS_ARCH_HAS_FREEBSD32
 	if (is_elf32_sysctl(pid))
 		return (procstat_getauxv32_sysctl(pid, cntp));
 #endif