diff --git a/media/libjpeg/moz.build b/media/libjpeg/moz.build
index f24b4fcf0f..1068e3f0ff 100644
--- a/media/libjpeg/moz.build
+++ b/media/libjpeg/moz.build
@@ -245,7 +245,7 @@ elif CONFIG['CPU_ARCH'].startswith('ppc'):
         'simd/powerpc/jsimd.c',
     ]
     for srcfile in ppc_vmx_sources:
-        SOURCES[srcfile].flags += CONFIG['PPC_VMX_FLAGS']
+        SOURCES[srcfile].flags += ['-maltivec']
 else: # No SIMD support?
     SOURCES += [
         'jsimd_none.c',