diff --git a/lib/libc/musl/src/thread/riscv32/clone.s b/lib/libc/musl/src/thread/riscv32/clone.s
index 3102239d0d..484f83a199 100644
--- a/lib/libc/musl/src/thread/riscv32/clone.s
+++ b/lib/libc/musl/src/thread/riscv32/clone.s
@@ -7,6 +7,8 @@
 .global __clone
 .type  __clone, %function
 __clone:
+	andi a1, a1, -16
+
 	# Save func and arg to stack
 	addi a1, a1, -16
 	sw a0, 0(a1)
diff --git a/lib/libc/musl/src/thread/riscv64/clone.s b/lib/libc/musl/src/thread/riscv64/clone.s
index db908248cd..187a28d2e7 100644
--- a/lib/libc/musl/src/thread/riscv64/clone.s
+++ b/lib/libc/musl/src/thread/riscv64/clone.s
@@ -7,6 +7,8 @@
 .global __clone
 .type  __clone, %function
 __clone:
+	andi a1, a1, -16
+
 	# Save func and arg to stack
 	addi a1, a1, -16
 	sd a0, 0(a1)