diff --git a/Libraries/LibC/stdlib.cpp b/Libraries/LibC/stdlib.cpp
index cd3b3385bb..368d01235d 100644
--- a/Libraries/LibC/stdlib.cpp
+++ b/Libraries/LibC/stdlib.cpp
@@ -290,7 +290,7 @@ int unsetenv(const char* name)
 
 int setenv(const char* name, const char* value, int overwrite)
 {
-    if (!overwrite && !getenv(name))
+    if (!overwrite && getenv(name))
         return 0;
     auto length = strlen(name) + strlen(value) + 2;
     auto* var = (char*)malloc(length);