diff --git a/litex/soc/software/liblitedram/sdram.c b/litex/soc/software/liblitedram/sdram.c
index 0dd9e213a..86c5e9b98 100644
--- a/litex/soc/software/liblitedram/sdram.c
+++ b/litex/soc/software/liblitedram/sdram.c
@@ -873,6 +873,8 @@ int sdrinit(void)
 /* MPR access                                                            */
 /*-----------------------------------------------------------------------*/
 
+#ifdef SDRAM_PHY_MODULES
+
 #define MPR0_SEL (0 << 0)
 #define MPR1_SEL (1 << 0)
 #define MPR2_SEL (2 << 0)
@@ -936,3 +938,5 @@ void sdrmpr(void)
 }
 
 #endif
+
+#endif