diff --git a/tlkm/hsa/char_device_hsa.c b/tlkm/hsa/char_device_hsa.c
index c1f6ef27..8d855ac9 100644
--- a/tlkm/hsa/char_device_hsa.c
+++ b/tlkm/hsa/char_device_hsa.c
@@ -58,6 +58,7 @@
 
 #define TLKM_HSA_MAJOR 421
 
+#ifdef __x86_64__
 /******************************************************************************/
 /* global struct and variable declarations */
 
@@ -516,4 +517,16 @@ void char_hsa_unregister(void)
 	}
 }
 
+#else
+
+// dummy functions on 32bit devices
+int char_hsa_register(struct tlkm_device *tlkm_dev)
+{
+	return 0;
+}
+
+void char_hsa_unregister(void) {}
+
+#endif
+
 /******************************************************************************/