diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
index dde89a4a0f5b..53859b6254d6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
@@ -462,7 +462,7 @@ nvkm_perfmon_mthd_query_domain(struct nvkm_perfmon *perfmon,
 
 		args->v0.id         = di;
 		args->v0.signal_nr  = nvkm_perfdom_count_perfsig(dom);
-		strncpy(args->v0.name, dom->name, sizeof(args->v0.name));
+		strncpy(args->v0.name, dom->name, sizeof(args->v0.name) - 1);
 
 		/* Currently only global counters (PCOUNTER) are implemented
 		 * but this will be different for local counters (MP). */
@@ -514,7 +514,7 @@ nvkm_perfmon_mthd_query_signal(struct nvkm_perfmon *perfmon,
 				 "/%s/%02x", dom->name, si);
 		} else {
 			strncpy(args->v0.name, sig->name,
-				sizeof(args->v0.name));
+				sizeof(args->v0.name) - 1);
 		}
 
 		args->v0.signal = si;
@@ -572,7 +572,7 @@ nvkm_perfmon_mthd_query_source(struct nvkm_perfmon *perfmon,
 
 		args->v0.source = sig->source[si];
 		args->v0.mask   = src->mask;
-		strncpy(args->v0.name, src->name, sizeof(args->v0.name));
+		strncpy(args->v0.name, src->name, sizeof(args->v0.name) - 1);
 	}
 
 	if (++si < source_nr) {