diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 3338b3f..8eaa8f8 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -31,5 +31,12 @@
 
 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
+#else
+static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
+	return -ENODEV;
+}
+static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
+	return -ENODEV;
+}
 #endif
 #endif