diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index ac5d5c61be3c..561384cd8677 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -48,11 +48,6 @@ typedef enum {
     TPM_TIS_STATE_RECEPTION,
 } TPMTISState;
 
-typedef struct TPMSizedBuffer {
-    uint32_t size;
-    uint8_t  *buffer;
-} TPMSizedBuffer;
-
 /* locality data  -- all fields are persisted */
 typedef struct TPMLocality {
     TPMTISState state;
diff --git a/hw/tpm/tpm_util.c b/hw/tpm/tpm_util.c
index 17cafbe6b303..747075e2442b 100644
--- a/hw/tpm/tpm_util.c
+++ b/hw/tpm/tpm_util.c
@@ -355,3 +355,10 @@ int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
 
     return 0;
 }
+
+void tpm_sized_buffer_reset(TPMSizedBuffer *tsb)
+{
+    g_free(tsb->buffer);
+    tsb->buffer = NULL;
+    tsb->size = 0;
+}
diff --git a/hw/tpm/tpm_util.h b/hw/tpm/tpm_util.h
index 2393b6bc0e4c..19b28474ae9a 100644
--- a/hw/tpm/tpm_util.h
+++ b/hw/tpm/tpm_util.h
@@ -42,4 +42,11 @@ int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
 #define DEFINE_PROP_TPMBE(_n, _s, _f)                     \
     DEFINE_PROP(_n, _s, _f, qdev_prop_tpm, TPMBackend *)
 
+typedef struct TPMSizedBuffer {
+    uint32_t size;
+    uint8_t  *buffer;
+} TPMSizedBuffer;
+
+void tpm_sized_buffer_reset(TPMSizedBuffer *tsb);
+
 #endif /* TPM_TPM_UTIL_H */