diff --git a/.gitignore b/.gitignore
index 4dc4215..35b23f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 nob
 nob.old
 nob.exe
+nob.exe.old
 build/
\ No newline at end of file
diff --git a/nob.h b/nob.h
index 4f752af..6d1fcbc 100644
--- a/nob.h
+++ b/nob.h
@@ -100,7 +100,9 @@
 #ifndef NOB_H_
 #define NOB_H_
 #ifdef _WIN32
-#define _CRT_SECURE_NO_WARNINGS (1)
+#ifndef _CRT_SECURE_NO_WARNINGS
+    #define _CRT_SECURE_NO_WARNINGS (1)
+#endif
 #endif
 
 #ifndef NOBDEF
@@ -1166,10 +1168,11 @@ static Nob_Proc nob__cmd_start_process(Nob_Cmd cmd, Nob_Fd *fdin, Nob_Fd *fdout,
     PROCESS_INFORMATION piProcInfo;
     ZeroMemory(&piProcInfo, sizeof(PROCESS_INFORMATION));
 
-    nob__win32_cmd_quote(cmd, &sb);
-    nob_sb_append_null(&sb);
-    BOOL bSuccess = CreateProcessA(NULL, sb.items, NULL, NULL, TRUE, 0, NULL, NULL, &siStartInfo, &piProcInfo);
-    nob_sb_free(sb);
+    Nob_String_Builder quoted = {0};
+    nob__win32_cmd_quote(cmd, &quoted);
+    nob_sb_append_null(&quoted);
+    BOOL bSuccess = CreateProcessA(NULL, quoted.items, NULL, NULL, TRUE, 0, NULL, NULL, &siStartInfo, &piProcInfo);
+    nob_sb_free(quoted);
 
     if (!bSuccess) {
         nob_log(NOB_ERROR, "Could not create child process for %s: %s", cmd.items[0], nob_win32_error_message(GetLastError()));
diff --git a/tests/win32_error.c b/tests/win32_error.c
index cc86920..3b0c78b 100644
--- a/tests/win32_error.c
+++ b/tests/win32_error.c
@@ -4,6 +4,6 @@
 int main(void) {
     nob_log(NOB_ERROR, "First 100 Win32 API Errors:");
     for (DWORD i = 0; i < 100; i++)
-        nob_log(NOB_ERROR, "%lu (0x%X): \"%s\"", i, i, nob_win32_error_message(i));
+        nob_log(NOB_ERROR, "%lu (0x%lX): \"%s\"", i, i, nob_win32_error_message(i));
     return 0;
 }