diff --git a/app/src/command.h b/app/src/command.h
index 9fc81c1c..555b5435 100644
--- a/app/src/command.h
+++ b/app/src/command.h
@@ -4,38 +4,8 @@
 #include <stdbool.h>
 #include <inttypes.h>
 
-#ifdef _WIN32
-
- // not needed here, but winsock2.h must never be included AFTER windows.h
-# include <winsock2.h>
-# include <windows.h>
-# define PATH_SEPARATOR '\\'
-# define PRIexitcode "lu"
-// <https://stackoverflow.com/a/44383330/1987178>
-# ifdef _WIN64
-#   define PRIsizet PRIu64
-# else
-#   define PRIsizet PRIu32
-# endif
-# define PROCESS_NONE NULL
-# define NO_EXIT_CODE -1u // max value as unsigned
-  typedef HANDLE process_t;
-  typedef DWORD exit_code_t;
-
-#else
-
-# include <sys/types.h>
-# define PATH_SEPARATOR '/'
-# define PRIsizet "zu"
-# define PRIexitcode "d"
-# define PROCESS_NONE -1
-# define NO_EXIT_CODE -1
-  typedef pid_t process_t;
-  typedef int exit_code_t;
-
-#endif
-
 #include "config.h"
+#include "common.h"
 
 enum process_result {
     PROCESS_SUCCESS,
diff --git a/app/src/common.h b/app/src/common.h
index e5cbe953..caa1bba3 100644
--- a/app/src/common.h
+++ b/app/src/common.h
@@ -5,6 +5,37 @@
 
 #include "config.h"
 
+#ifdef _WIN32
+
+ // not needed here, but winsock2.h must never be included AFTER windows.h
+# include <winsock2.h>
+# include <windows.h>
+# define PATH_SEPARATOR '\\'
+# define PRIexitcode "lu"
+// <https://stackoverflow.com/a/44383330/1987178>
+# ifdef _WIN64
+#   define PRIsizet PRIu64
+# else
+#   define PRIsizet PRIu32
+# endif
+# define PROCESS_NONE NULL
+# define NO_EXIT_CODE -1u // max value as unsigned
+  typedef HANDLE process_t;
+  typedef DWORD exit_code_t;
+
+#else
+
+# include <sys/types.h>
+# define PATH_SEPARATOR '/'
+# define PRIsizet "zu"
+# define PRIexitcode "d"
+# define PROCESS_NONE -1
+# define NO_EXIT_CODE -1
+  typedef pid_t process_t;
+  typedef int exit_code_t;
+
+#endif
+
 #define ARRAY_LEN(a) (sizeof(a) / sizeof(a[0]))
 #define MIN(X,Y) (X) < (Y) ? (X) : (Y)
 #define MAX(X,Y) (X) > (Y) ? (X) : (Y)