diff --git a/lib/Makefile b/lib/Makefile
index 9c3b9a34..4d02c337 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,12 +35,12 @@ endif
 
 XFLAGS += -I$(TOP)
 
-I386_O = libtcc1.o alloca.o alloca-bt.o $(COMMON_O)
-X86_64_O = libtcc1.o alloca.o alloca-bt.o $(COMMON_O)
-ARM_O = libtcc1.o armeabi.o alloca.o armflush.o $(COMMON_O)
-ARM64_O = lib-arm64.o alloca.o $(COMMON_O)
+I386_O = libtcc1.o alloca-bt.o $(COMMON_O)
+X86_64_O = libtcc1.o alloca-bt.o $(COMMON_O)
+ARM_O = libtcc1.o armeabi.o armflush.o $(COMMON_O)
+ARM64_O = lib-arm64.o $(COMMON_O)
 RISCV64_O = lib-arm64.o $(COMMON_O)
-COMMON_O = stdatomic.o atomic.o builtin.o
+COMMON_O = stdatomic.o atomic.o builtin.o alloca.o
 WIN_O = crt1.o crt1w.o wincrt1.o wincrt1w.o dllcrt1.o dllmain.o
 LIN_O = dsohandle.o
 OSX_O =
diff --git a/lib/alloca.S b/lib/alloca.S
index 83d167f4..f37be59d 100644
--- a/lib/alloca.S
+++ b/lib/alloca.S
@@ -142,4 +142,18 @@ p100:
 #endif
     .size   alloca, .-alloca
 /* ---------------------------------------------- */
+#elif defined __riscv
+
+	.text
+	.align	2
+	.global	alloca
+	.type	alloca, %function
+alloca:
+	sub	sp, sp, a0
+	addi	sp, sp, -15
+	andi	sp, sp, -16
+	add	a0, sp, zero
+	ret
+	.size	alloca, .-alloca
+/* ---------------------------------------------- */
 #endif