diff --git a/coregrind/arch/x86-linux/vg_libpthread.c b/coregrind/arch/x86-linux/vg_libpthread.c
index f6ba33c..0591fc0 100644
--- a/coregrind/arch/x86-linux/vg_libpthread.c
+++ b/coregrind/arch/x86-linux/vg_libpthread.c
@@ -1450,7 +1450,7 @@
 int pthread_key_delete(pthread_key_t key)
 {
    int res;
-   ensure_valgrind("pthread_key_create");
+   ensure_valgrind("pthread_key_delete");
    if (!key_is_valid(key))
       return EINVAL;
    VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */,
diff --git a/coregrind/vg_libpthread.c b/coregrind/vg_libpthread.c
index f6ba33c..0591fc0 100644
--- a/coregrind/vg_libpthread.c
+++ b/coregrind/vg_libpthread.c
@@ -1450,7 +1450,7 @@
 int pthread_key_delete(pthread_key_t key)
 {
    int res;
-   ensure_valgrind("pthread_key_create");
+   ensure_valgrind("pthread_key_delete");
    if (!key_is_valid(key))
       return EINVAL;
    VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */,