diff --git a/include/asm-ppc/ibm4xx.h b/include/asm-ppc/ibm4xx.h
index cf62b69..499c146 100644
--- a/include/asm-ppc/ibm4xx.h
+++ b/include/asm-ppc/ibm4xx.h
@@ -86,7 +86,7 @@
 #define PCI_DRAM_OFFSET	0
 #endif
 
-#elif CONFIG_44x
+#elif defined(CONFIG_44x)
 
 #if defined(CONFIG_BAMBOO)
 #include <platforms/4xx/bamboo.h>