diff --git a/arch/powerpc/oprofile/op_model_cell.c b/arch/powerpc/oprofile/op_model_cell.c
index 35141a8bc3d9..6b2d974880b6 100644
--- a/arch/powerpc/oprofile/op_model_cell.c
+++ b/arch/powerpc/oprofile/op_model_cell.c
@@ -830,7 +830,7 @@ static int calculate_lfsr(int n)
 static int pm_rtas_activate_spu_profiling(u32 node)
 {
 	int ret, i;
-	struct pm_signal pm_signal_local[NR_PHYS_CTRS];
+	struct pm_signal pm_signal_local[NUM_SPUS_PER_NODE];
 
 	/*
 	 * Set up the rtas call to configure the debug bus to