diff --git a/386/include/ape/stdarg.h b/386/include/ape/stdarg.h
index 05d033e4c..295b88b95 100644
--- a/386/include/ape/stdarg.h
+++ b/386/include/ape/stdarg.h
@@ -7,5 +7,5 @@ typedef char *va_list;
 (char *)(&(start)+1))
 #define va_end(list)
 #define va_arg(list, mode) ((mode*)(list += sizeof(mode)))[-1]
-
+#define va_copy(dst, src) ((dst) = (src))
 #endif /* __STDARG */
diff --git a/68020/include/ape/stdarg.h b/68020/include/ape/stdarg.h
index b7e2282e6..9a1f08c7e 100644
--- a/68020/include/ape/stdarg.h
+++ b/68020/include/ape/stdarg.h
@@ -7,5 +7,6 @@ typedef char *va_list;
 #define va_end(list)
 #define va_arg(list, mode) (sizeof(mode)==1 ? ((mode *) (list += 4))[-4] : \
 sizeof(mode)==2 ? ((mode *) (list += 4))[-2] : ((mode *) (list += sizeof(mode)))[-1])
+#define va_copy(dst, src) ((dst) = (src))
 
 #endif /* __STDARG */
diff --git a/amd64/include/ape/stdarg.h b/amd64/include/ape/stdarg.h
index cf466841f..b687c5a46 100644
--- a/amd64/include/ape/stdarg.h
+++ b/amd64/include/ape/stdarg.h
@@ -3,8 +3,10 @@
 
 typedef char *va_list;
 
-#define va_start(list, start) list = (sizeof(start)<8 ? (char *)((long long *)&(start)+1) : \
-(char *)(&(start)+1))
+#define va_start(list, start) \
+	(list = (sizeof(start)<8 ? \
+		(char *)((long long *)&(start)+1) : \
+		(char *)(&(start)+1)))
 #define va_end(list)
 #define va_arg(list, mode)\
 	((sizeof(mode) == 1)?\
@@ -14,5 +16,7 @@ typedef char *va_list;
 	(sizeof(mode) == 4)?\
 		((mode*)(list += 8))[-2]:\
 		((mode*)(list += sizeof(mode)))[-1])
+#define va_copy(dst, src) \
+	((dst) = (src))
 
 #endif /* __STDARG */
diff --git a/arm/include/ape/stdarg.h b/arm/include/ape/stdarg.h
index 05d033e4c..eb1c097a7 100644
--- a/arm/include/ape/stdarg.h
+++ b/arm/include/ape/stdarg.h
@@ -7,5 +7,6 @@ typedef char *va_list;
 (char *)(&(start)+1))
 #define va_end(list)
 #define va_arg(list, mode) ((mode*)(list += sizeof(mode)))[-1]
+#define va_copy(dst, src) ((dst) = (src))
 
 #endif /* __STDARG */
diff --git a/arm64/include/ape/stdarg.h b/arm64/include/ape/stdarg.h
index cf466841f..9486c08e5 100644
--- a/arm64/include/ape/stdarg.h
+++ b/arm64/include/ape/stdarg.h
@@ -14,5 +14,6 @@ typedef char *va_list;
 	(sizeof(mode) == 4)?\
 		((mode*)(list += 8))[-2]:\
 		((mode*)(list += sizeof(mode)))[-1])
+#define va_copy(dst, src) ((dst) = (src))
 
 #endif /* __STDARG */
diff --git a/mips/include/ape/stdarg.h b/mips/include/ape/stdarg.h
index b7e2282e6..9a1f08c7e 100644
--- a/mips/include/ape/stdarg.h
+++ b/mips/include/ape/stdarg.h
@@ -7,5 +7,6 @@ typedef char *va_list;
 #define va_end(list)
 #define va_arg(list, mode) (sizeof(mode)==1 ? ((mode *) (list += 4))[-4] : \
 sizeof(mode)==2 ? ((mode *) (list += 4))[-2] : ((mode *) (list += sizeof(mode)))[-1])
+#define va_copy(dst, src) ((dst) = (src))
 
 #endif /* __STDARG */
diff --git a/power/include/ape/stdarg.h b/power/include/ape/stdarg.h
index b7e2282e6..9a1f08c7e 100644
--- a/power/include/ape/stdarg.h
+++ b/power/include/ape/stdarg.h
@@ -7,5 +7,6 @@ typedef char *va_list;
 #define va_end(list)
 #define va_arg(list, mode) (sizeof(mode)==1 ? ((mode *) (list += 4))[-4] : \
 sizeof(mode)==2 ? ((mode *) (list += 4))[-2] : ((mode *) (list += sizeof(mode)))[-1])
+#define va_copy(dst, src) ((dst) = (src))
 
 #endif /* __STDARG */
diff --git a/sparc64/include/ape/stdarg.h b/sparc64/include/ape/stdarg.h
index b7e2282e6..9a1f08c7e 100644
--- a/sparc64/include/ape/stdarg.h
+++ b/sparc64/include/ape/stdarg.h
@@ -7,5 +7,6 @@ typedef char *va_list;
 #define va_end(list)
 #define va_arg(list, mode) (sizeof(mode)==1 ? ((mode *) (list += 4))[-4] : \
 sizeof(mode)==2 ? ((mode *) (list += 4))[-2] : ((mode *) (list += sizeof(mode)))[-1])
+#define va_copy(dst, src) ((dst) = (src))
 
 #endif /* __STDARG */