diff --git a/unix/uxutils.c b/unix/uxutils.c
index 467e5bcc..4a63ac86 100644
--- a/unix/uxutils.c
+++ b/unix/uxutils.c
@@ -1,36 +1,10 @@
 #include "putty.h"
 #include "ssh.h"
 
+#include "uxutils.h"
+
 #if defined __arm__ || defined __aarch64__
 
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-
-#ifdef HAVE_SYS_AUXV_H
-#include <sys/auxv.h>
-#endif
-
-#ifdef HAVE_ASM_HWCAP_H
-#include <asm/hwcap.h>
-#endif
-
-#if defined HAVE_GETAUXVAL
-/* No code needed: getauxval has just the API we want already */
-#elif defined HAVE_ELF_AUX_INFO
-/* Implement the simple getauxval API in terms of FreeBSD elf_aux_info */
-static inline u_long getauxval(int which)
-{
-    u_long toret;
-    if (elf_aux_info(which, &toret, sizeof(toret)) != 0)
-        return 0;                      /* elf_aux_info didn't work */
-    return toret;
-}
-#else
-/* Implement a stub getauxval which returns no capabilities */
-static inline u_long getauxval(int which) { return 0; }
-#endif
-
 bool platform_aes_hw_available(void)
 {
 #if defined HWCAP_AES
diff --git a/unix/uxutils.h b/unix/uxutils.h
new file mode 100644
index 00000000..4e8dc808
--- /dev/null
+++ b/unix/uxutils.h
@@ -0,0 +1,45 @@
+/*
+ * uxutils.h: header included only by uxutils.c.
+ *
+ * The only reason this is a header file instead of a source file is
+ * so that I can define 'static inline' functions which may or may not
+ * be used, without provoking a compiler warning when I turn out not
+ * to use them in the subsequent source file.
+ */
+
+#ifndef PUTTY_UXUTILS_H
+#define PUTTY_UXUTILS_H
+
+#if defined __arm__ || defined __aarch64__
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_AUXV_H
+#include <sys/auxv.h>
+#endif
+
+#ifdef HAVE_ASM_HWCAP_H
+#include <asm/hwcap.h>
+#endif
+
+#if defined HAVE_GETAUXVAL
+/* No code needed: getauxval has just the API we want already */
+#elif defined HAVE_ELF_AUX_INFO
+/* Implement the simple getauxval API in terms of FreeBSD elf_aux_info */
+static inline u_long getauxval(int which)
+{
+    u_long toret;
+    if (elf_aux_info(which, &toret, sizeof(toret)) != 0)
+        return 0;                      /* elf_aux_info didn't work */
+    return toret;
+}
+#else
+/* Implement a stub getauxval which returns no capabilities */
+static inline u_long getauxval(int which) { return 0; }
+#endif
+
+#endif /* defined __arm__ || defined __aarch64__ */
+
+#endif /* PUTTY_UXUTILS_H */