diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c
index 09c1346ec7..cd1fbdf73b 100644
--- a/src/drivers/spi/tpm/tpm.c
+++ b/src/drivers/spi/tpm/tpm.c
@@ -53,7 +53,7 @@ static struct tpm_spi_if tpm_if = {
 };
 
 /* Cached TPM device identification. */
-struct tpm2_info tpm_info;
+static struct tpm2_info tpm_info;
 
 /*
  * TODO(vbendeb): make CONFIG_DEBUG_TPM an int to allow different level of