diff --git a/sourcehook/sourcehook.cpp b/sourcehook/sourcehook.cpp
index 380aab4..6927316 100644
--- a/sourcehook/sourcehook.cpp
+++ b/sourcehook/sourcehook.cpp
@@ -473,7 +473,7 @@ namespace SourceHook
 		}
 	}
 
-#if __linux__
+#ifdef __linux__
 	// Windows has an implentation for this already, but Linux does not :(
 	static bool CSourceHookImpl::IsBadReadPtr(const void *ptr, size_t len)
 	{