diff --git a/src/common_io.c b/src/common_io.c
index 5f345b2ac5f2c4f8472a5bcd225dc177ead03591..efeed75f01dbb36c0f2c24fb9388e812890f44fe 100644
--- a/src/common_io.c
+++ b/src/common_io.c
@@ -489,7 +489,7 @@ void prepare_dm_gparts(struct gpart* gparts, int Ndm) {
   for (int i = 0; i < Ndm; ++i) {
 
     /* 0 ir negative ids are not allowed */
-    if(gparts[i].id <= 0) error("0 or negative if for DM particle");
+    if(gparts[i].id <= 0) error("0 or negative ID for DM particle");
     
     gparts[i].id = -gparts[i].id;
   }