diff --git a/contrib/powerpc-vsx/linux.c b/contrib/powerpc-vsx/linux.c
index c0a4eca2d..f54f65f59 100644
--- a/contrib/powerpc-vsx/linux.c
+++ b/contrib/powerpc-vsx/linux.c
@@ -35,6 +35,8 @@ png_have_vsx(png_structp png_ptr)
    char input[MAXLINE];
    char *token = NULL;
 
+   PNG_UNUSED(png_ptr)
+
    f = fopen("/proc/cpuinfo", "r");
    if (f != NULL)
    {
diff --git a/contrib/powerpc-vsx/linux_aux.c b/contrib/powerpc-vsx/linux_aux.c
index c21120cf3..058bb02b3 100644
--- a/contrib/powerpc-vsx/linux_aux.c
+++ b/contrib/powerpc-vsx/linux_aux.c
@@ -22,7 +22,11 @@
 static int
 png_have_vsx(png_structp png_ptr)
 {
+
    const unsigned long auxv = getauxval( AT_HWCAP );
+
+   PNG_UNUSED(png_ptr)
+
    if(auxv & (PPC_FEATURE_HAS_ALTIVEC|PPC_FEATURE_HAS_VSX ))
       return 1;
    else