diff --git a/include/logging/log_instance.h b/include/logging/log_instance.h
index 25eb47f3f2c..197ea4ebb23 100644
--- a/include/logging/log_instance.h
+++ b/include/logging/log_instance.h
@@ -35,6 +35,10 @@ struct log_source_dynamic_data {
 	 */
 	uint32_t dummy[2];
 #endif
+#if defined(CONFIG_RISCV) && defined(CONFIG_64BIT)
+	/* Workaround: RV64 needs to ensure that structure is just 8 bytes. */
+	uint32_t dummy;
+#endif
 };
 
 /** @brief Creates name of variable and section for constant log data.