diff --git a/tests/kernel/mem_protect/mem_protect/src/mem_protect.h b/tests/kernel/mem_protect/mem_protect/src/mem_protect.h
index ba5d750c6c1..c125f169a0a 100644
--- a/tests/kernel/mem_protect/mem_protect/src/mem_protect.h
+++ b/tests/kernel/mem_protect/mem_protect/src/mem_protect.h
@@ -136,7 +136,8 @@ static inline void set_fault_valid(bool valid)
 
 
 
-#if defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
+#if (defined(CONFIG_X86_64) || defined(CONFIG_ARM64) || \
+	(defined(CONFIG_RISCV) && defined(CONFIG_64BIT)))
 #define TEST_HEAP_SIZE	(2 << CONFIG_MAX_THREAD_BYTES) * 1024
 #define MAX_OBJ 512
 #else