diff --git a/bjm.c b/bjm.c
index 6215019..20085c5 100644
--- a/bjm.c
+++ b/bjm.c
@@ -144,7 +144,7 @@
 					for (idx=0; idx<ret; idx++) {
 						if (idx!=0)
 							tprintf(",");
-						tprintf(mod);
+						tprintf("%s", mod);
 						mod+=strlen(mod)+1;
 					}
 					free(data);
diff --git a/process.c b/process.c
index edbc8d5..f62f98d 100644
--- a/process.c
+++ b/process.c
@@ -1695,7 +1695,7 @@
 		}
 		if (cp == 0)
 			break;
-		tprintf(sep);
+		tprintf("%s", sep);
 		printstr(tcp, (long) cp, -1);
 		addr += sizeof(char *);
 	}
diff --git a/signal.c b/signal.c
index 145fe08..cec367c 100644
--- a/signal.c
+++ b/signal.c
@@ -395,7 +395,7 @@
 printsignal(nr)
 int nr;
 {
-	tprintf(signame(nr));
+	tprintf("%s", signame(nr));
 }
 
 #ifdef LINUX