diff --git a/src/target/arm_dpm.c b/src/target/arm_dpm.c
index 5f7e9291b..fd6fb263f 100644
--- a/src/target/arm_dpm.c
+++ b/src/target/arm_dpm.c
@@ -1050,7 +1050,7 @@ int arm_dpm_setup(struct arm_dpm *dpm)
 {
 	struct arm *arm = dpm->arm;
 	struct target *target = arm->target;
-	struct reg_cache *cache = 0;
+	struct reg_cache *cache = NULL;
 
 	arm->dpm = dpm;