diff --git a/core/filesystem.c b/core/filesystem.c
index 4da300c..baa6d6e 100644
--- a/core/filesystem.c
+++ b/core/filesystem.c
@@ -381,7 +381,7 @@ OS_API OS_Date OS_GetDate(void) {
     return result;
 }
 
-#else
+#elif __linux__ || __APPLE__ || __unix__
     #include <unistd.h>
     #include <limits.h>
     #include <sys/stat.h>
@@ -690,9 +690,9 @@ OS_API OS_Result OS_WriteFile(S8_String path, S8_String string) {
     return result;
 }
     #endif
-
 #endif
 
+#if _WIN32 || __linux__ || __APPLE__ || __unix__
 OS_API int OS_SystemF(const char *string, ...) {
     MA_Checkpoint scratch = MA_GetScratch();
     S8_FORMAT(scratch.arena, string, result);
@@ -746,3 +746,4 @@ OS_API S8_String OS_ExpandIncludes(MA_Arena *arena, S8_String filepath) {
     }
     return result;
 }
+#endif
\ No newline at end of file
diff --git a/standalone_libraries/arena.c b/standalone_libraries/arena.c
index 0cc8d67..fced116 100644
--- a/standalone_libraries/arena.c
+++ b/standalone_libraries/arena.c
@@ -434,7 +434,7 @@ MA_API bool MV_DecommitPos(MV_Memory *m, size_t pos) {
     return false;
 }
 
-#else
+#elif __unix__ || __linux__ || __APPLE__
     #include <sys/mman.h>
     #define MV__UNIX_PAGE_SIZE 4096
 MA_API MV_Memory MV_Reserve(size_t size) {
@@ -465,4 +465,17 @@ MA_API void MV_Deallocate(MV_Memory *m) {
     int result = munmap(m->data, m->reserve);
     MA_Assertf(result == 0, "Failed to release virtual memory using munmap");
 }
+#else
+MA_API MV_Memory MV_Reserve(size_t size) {
+    MV_Memory result = {0};
+    return result;
+}
+
+MA_API bool MV_Commit(MV_Memory *m, size_t commit) {
+    return false;
+}
+
+MA_API void MV_Deallocate(MV_Memory *m) {
+}
+
 #endif
\ No newline at end of file
diff --git a/standalone_libraries/io.c b/standalone_libraries/io.c
index b15f9b6..935c00b 100644
--- a/standalone_libraries/io.c
+++ b/standalone_libraries/io.c
@@ -203,9 +203,8 @@ IO_API IO_ErrorResult IO_OutputError(char *str, int len) {
 IO_API void IO_Exit(int error_code) {
     ExitProcess(error_code);
 }
-#else // _WIN32 else // LIBC
+#elif __linux__ || __unix__ || __APPLE__
     #include <stdio.h>
-
 IO_API IO_ErrorResult IO_OutputError(char *str, int len) {
     fprintf(stderr, "%.*s", len, str);
     return IO_ErrorResult_Exit;
@@ -222,4 +221,19 @@ IO_API void IO_Exit(int error_code) {
 IO_API bool IO_IsDebuggerPresent(void) {
     return false;
 }
+#else
+IO_API IO_ErrorResult IO_OutputError(char *str, int len) {
+    return IO_ErrorResult_Exit;
+}
+
+IO_API void IO_OutputMessage(char *str, int len) {
+}
+
+IO_API void IO_Exit(int error_code) {
+}
+
+IO_API bool IO_IsDebuggerPresent(void) {
+    return false;
+}
+
 #endif // LIBC
diff --git a/standalone_libraries/preproc_env.h b/standalone_libraries/preproc_env.h
index a6a5383..77b8084 100644
--- a/standalone_libraries/preproc_env.h
+++ b/standalone_libraries/preproc_env.h
@@ -11,6 +11,7 @@
 #elif defined(__linux__)
     #define OS_POSIX 1
     #define OS_LINUX 1
+#elif OS_WASM
 #else
     #error Unsupported platform
 #endif
@@ -109,6 +110,8 @@
     #define OS_NAME "linux"
 #elif OS_MAC
     #define OS_NAME "mac_os"
+#elif OS_WASM
+    #define OS_NAME "wasm"
 #else
     #error couldnt figure out OS
 #endif