diff --git a/arch/powerpc/cpu/ppc4xx/speed.c b/arch/powerpc/cpu/ppc4xx/speed.c
index 4d7eb29..abd4e91 100644
--- a/arch/powerpc/cpu/ppc4xx/speed.c
+++ b/arch/powerpc/cpu/ppc4xx/speed.c
@@ -902,7 +902,7 @@
 	/*
 	 * Read CPR_PRIMAD register
 	 */
-	mfcpr(CPC0_PRIMAD, cpr_primad);
+	mfcpr(CPR0_PRIMAD, cpr_primad);
 
 	/*
 	 * Determine PLB_DIV.