diff --git a/main.cpp b/main.cpp
index d29fe95..31ae4dc 100644
--- a/main.cpp
+++ b/main.cpp
@@ -10,6 +10,7 @@
 #include <lib.h>
 #include <stdlib.h>
 #include <filesystem>
+#include "win32compat.h"
 #include "bitmapx16.h"
 using std::vector;
 using std::map;
@@ -65,7 +66,7 @@ int main(int argc, char **argv) {
 	bool probe_only = false;
 	std::filesystem::path executable_path = std::filesystem::weakly_canonical(*argv).parent_path();
 #ifdef _WIN32
-	_setenv("MAGICK_CODER_MODULE_PATH", executable_path.c_str(), 0);
+	setenv("MAGICK_CODER_MODULE_PATH", executable_path.c_str(), 0);
 #endif
 	InitializeMagick(*argv);
 	argc--;
diff --git a/win32compat.h b/win32compat.h
new file mode 100644
index 0000000..8bb6212
--- /dev/null
+++ b/win32compat.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#ifdef _WIN32
+#include <stdlib.h>
+inline void setenv(char const *variable, char const *value, bool replace) {
+	if (replace || getenv(variable) == NULL || getenv(variable) == "") {
+		if (value == NULL) {
+			_putenv_s(variable, "");
+		} else {
+			_putenv_s(variable, value);
+		}
+	}
+}
+#else
+#include <unistd.h>
+#endif
\ No newline at end of file