diff --git a/src/viminfo.c b/src/viminfo.c
index aca2431..6b92cc6 100644
--- a/src/viminfo.c
+++ b/src/viminfo.c
@@ -1376,6 +1376,7 @@
 		    case VAR_PARTIAL:
 		    case VAR_JOB:
 		    case VAR_CHANNEL:
+		    case VAR_INSTR:
 				     continue;
 		}
 		fprintf(fp, "!%s\t%s\t", this_var->di_key, s);