diff --git a/include/sound/sof/info.h b/include/sound/sof/info.h
index 68e92b55043942..c88778e5683748 100644
--- a/include/sound/sof/info.h
+++ b/include/sound/sof/info.h
@@ -110,9 +110,9 @@ struct sof_ipc_cc_version {
 	/* reserved for future use */
 	uint32_t reserved[4];
 
-	char name[16]; /* null terminated compiler name */
-	char optim[4]; /* null terminated compiler -O flag value */
-	char desc[]; /* null terminated compiler description */
+	uint8_t name[16]; /* null terminated compiler name */
+	uint8_t optim[4]; /* null terminated compiler -O flag value */
+	uint8_t desc[32]; /* null terminated compiler description */
 } __packed;
 
 /* extended data: Probe setup */
diff --git a/include/sound/sof/topology.h b/include/sound/sof/topology.h
index 8f8d1cf649f2e0..6a6b4791eaf65e 100644
--- a/include/sound/sof/topology.h
+++ b/include/sound/sof/topology.h
@@ -220,7 +220,7 @@ struct sof_ipc_comp_process {
 	/* reserved for future use */
 	uint32_t reserved[7];
 
-	unsigned char data[0];
+	uint8_t data[0];
 } __packed;
 
 /* frees components, buffers and pipelines
diff --git a/include/sound/sof/trace.h b/include/sound/sof/trace.h
index fda6e8f6ead4e9..8056f214946d9c 100644
--- a/include/sound/sof/trace.h
+++ b/include/sound/sof/trace.h
@@ -72,7 +72,7 @@ struct sof_ipc_dma_trace_posn {
 struct sof_ipc_panic_info {
 	struct sof_ipc_hdr hdr;
 	uint32_t code;			/* SOF_IPC_PANIC_ */
-	char filename[SOF_TRACE_FILENAME_SIZE];
+	uint8_t filename[SOF_TRACE_FILENAME_SIZE];
 	uint32_t linenum;
 }  __packed;
 
diff --git a/include/uapi/sound/sof/abi.h b/include/uapi/sound/sof/abi.h
index e0fa2939d49c2f..6c802a2386efc2 100644
--- a/include/uapi/sound/sof/abi.h
+++ b/include/uapi/sound/sof/abi.h
@@ -26,7 +26,7 @@
 
 /* SOF ABI version major, minor and patch numbers */
 #define SOF_ABI_MAJOR 3
-#define SOF_ABI_MINOR 14
+#define SOF_ABI_MINOR 15
 #define SOF_ABI_PATCH 0
 
 /* SOF ABI version number. Format within 32bit word is MMmmmppp */