diff --git a/aarch64.c b/aarch64.c
index a77bb075..980686b8 100644
--- a/aarch64.c
+++ b/aarch64.c
@@ -2,17 +2,6 @@
 #include "libco.h"
 #include "settings.h"
 
-#if !defined(LIBCO_ASSERT)
-  #include <assert.h>
-  #define LIBCO_ASSERT(...) assert(__VA_ARGS__)
-#endif
-
-#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
-  #include <stdlib.h>
-  #define LIBCO_MALLOC(...) malloc(__VA_ARGS__)
-  #define LIBCO_FREE(...)   free(__VA_ARGS__)
-#endif
-
 #include <stdint.h>
 #ifdef LIBCO_MPROTECT
   #include <unistd.h>
diff --git a/amd64.c b/amd64.c
index 833b5e2e..fa454809 100644
--- a/amd64.c
+++ b/amd64.c
@@ -2,17 +2,6 @@
 #include "libco.h"
 #include "settings.h"
 
-#if !defined(LIBCO_ASSERT)
-  #include <assert.h>
-  #define LIBCO_ASSERT(...) assert(__VA_ARGS__)
-#endif
-
-#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
-  #include <stdlib.h>
-  #define LIBCO_MALLOC(...) malloc(__VA_ARGS__)
-  #define LIBCO_FREE(...)   free(__VA_ARGS__)
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/arm.c b/arm.c
index 4a4aef51..6f0aa24d 100644
--- a/arm.c
+++ b/arm.c
@@ -2,17 +2,6 @@
 #include "libco.h"
 #include "settings.h"
 
-#if !defined(LIBCO_ASSERT)
-  #include <assert.h>
-  #define LIBCO_ASSERT(...) assert(__VA_ARGS__)
-#endif
-
-#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
-  #include <stdlib.h>
-  #define LIBCO_MALLOC(...) malloc(__VA_ARGS__)
-  #define LIBCO_FREE(...)   free(__VA_ARGS__)
-#endif
-
 #ifdef LIBCO_MPROTECT
   #include <unistd.h>
   #include <sys/mman.h>
diff --git a/ppc.c b/ppc.c
index bcbdf966..a39d558e 100644
--- a/ppc.c
+++ b/ppc.c
@@ -4,12 +4,6 @@
 #include "libco.h"
 #include "settings.h"
 
-#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
-  #include <stdlib.h>
-  #define LIBCO_MALLOC(...) malloc(__VA_ARGS__)
-  #define LIBCO_FREE(...)   free(__VA_ARGS__)
-#endif
-
 #include <stdint.h>
 #include <string.h>
 
diff --git a/ppc64v2.c b/ppc64v2.c
index 1cac8843..d302a28a 100644
--- a/ppc64v2.c
+++ b/ppc64v2.c
@@ -6,12 +6,6 @@
 
 #include <stdint.h>
 
-#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
-  #include <stdlib.h>
-  #define LIBCO_MALLOC(...) malloc(__VA_ARGS__)
-  #define LIBCO_FREE(...)   free(__VA_ARGS__)
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/settings.h b/settings.h
index d8037bc4..695ebfb7 100644
--- a/settings.h
+++ b/settings.h
@@ -26,6 +26,17 @@
   #define alignas(bytes)
 #endif
 
+#if !defined(LIBCO_ASSERT)
+  #include <assert.h>
+  #define LIBCO_ASSERT assert
+#endif
+
+#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
+  #include <stdlib.h>
+  #define LIBCO_MALLOC malloc
+  #define LIBCO_FREE   free
+#endif
+
 #if defined(_MSC_VER)
   #define section(name) __declspec(allocate("." #name))
 #elif defined(__APPLE__)
@@ -34,5 +45,6 @@
   #define section(name) __attribute__((section("." #name "#")))
 #endif
 
+
 /* if defined(LIBCO_C) */
 #endif
diff --git a/x86.c b/x86.c
index d2c760ad..d31b4ac3 100644
--- a/x86.c
+++ b/x86.c
@@ -2,17 +2,6 @@
 #include "libco.h"
 #include "settings.h"
 
-#if !defined(LIBCO_ASSERT)
-  #include <assert.h>
-  #define LIBCO_ASSERT(...) assert(__VA_ARGS__)
-#endif
-
-#if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
-  #include <stdlib.h>
-  #define LIBCO_MALLOC(...) malloc(__VA_ARGS__)
-  #define LIBCO_FREE(...)   free(__VA_ARGS__)
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif