diff --git a/stand/common/interp_forth.c b/stand/common/interp_forth.c
index 31ba1f7c2967..8884e4f70967 100644
--- a/stand/common/interp_forth.c
+++ b/stand/common/interp_forth.c
@@ -144,7 +144,7 @@ bf_command(FICL_VM *vm)
 		printf("%s\n", command_errmsg);
 		break;
 	case CMD_FATAL:
-		panic("%s\n", command_errmsg);
+		panic("%s", command_errmsg);
 	}
 
 	free(line);
diff --git a/stand/i386/libi386/biosdisk.c b/stand/i386/libi386/biosdisk.c
index ef2e3fb56e39..fa6f9e05fd07 100644
--- a/stand/i386/libi386/biosdisk.c
+++ b/stand/i386/libi386/biosdisk.c
@@ -646,7 +646,7 @@ bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
 	}
 
 	if (V86_IO_BUFFER_SIZE / BD(dev).bd_sectorsize == 0)
-		panic("BUG: Real mode buffer is too small\n");
+		panic("BUG: Real mode buffer is too small");
 
 	bbuf = PTOV(V86_IO_BUFFER);
 	rest = size;
diff --git a/stand/libsa/arp.c b/stand/libsa/arp.c
index 3d298fff2058..7d49559b4e04 100644
--- a/stand/libsa/arp.c
+++ b/stand/libsa/arp.c
@@ -120,7 +120,7 @@ arpwhohas(struct iodesc *d, struct in_addr addr)
 	    arpsend, &wbuf.data, sizeof(wbuf.data),
 	    arprecv, &pkt, (void **)&ah, NULL);
 	if (i == -1) {
-		panic("arp: no response for %s\n",
+		panic("arp: no response for %s",
 			  inet_ntoa(addr));
 	}
 
diff --git a/stand/libsa/assert.c b/stand/libsa/assert.c
index 8eec63a4729a..74b9fb4bacbf 100644
--- a/stand/libsa/assert.c
+++ b/stand/libsa/assert.c
@@ -35,10 +35,10 @@ void
 __assert(const char *func, const char *file, int line, const char *expression)
 {
 	if (func == NULL)
-		panic("Assertion failed: (%s), file %s, line %d.\n",
+		panic("Assertion failed: (%s), file %s, line %d.",
 		    expression, file, line);
 	else
 		panic(
-		    "Assertion failed: (%s), function %s, file %s, line %d.\n",
+		    "Assertion failed: (%s), function %s, file %s, line %d.",
 		    expression, func, file, line);
 }
diff --git a/stand/libsa/bzipfs.c b/stand/libsa/bzipfs.c
index ff1514efeed3..47380ae72e5e 100644
--- a/stand/libsa/bzipfs.c
+++ b/stand/libsa/bzipfs.c
@@ -360,7 +360,7 @@ bzf_stat(struct open_file *f, struct stat *sb)
 void
 bz_internal_error(int errorcode)
 {
-    panic("bzipfs: critical error %d in bzip2 library occured\n", errorcode);
+    panic("bzipfs: critical error %d in bzip2 library occured", errorcode);
 }
 
 #ifdef REGRESSION
diff --git a/stand/libsa/netif.c b/stand/libsa/netif.c
index 105f9a31ab5d..d255cc663d5a 100644
--- a/stand/libsa/netif.c
+++ b/stand/libsa/netif.c
@@ -182,7 +182,7 @@ netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
 	desc->io_netif = nif; 
 #ifdef PARANOID
 	if (drv->netif_init == NULL)
-		panic("%s%d: no netif_init support\n", drv->netif_bname,
+		panic("%s%d: no netif_init support", drv->netif_bname,
 		    nif->nif_unit);
 #endif
 	drv->netif_init(desc, machdep_hint);
@@ -201,7 +201,7 @@ netif_detach(struct netif *nif)
 #endif
 #ifdef PARANOID
 	if (drv->netif_end == NULL)
-		panic("%s%d: no netif_end support\n", drv->netif_bname,
+		panic("%s%d: no netif_end support", drv->netif_bname,
 		    nif->nif_unit);
 #endif
 	drv->netif_end(nif);
@@ -222,7 +222,7 @@ netif_get(struct iodesc *desc, void **pkt, time_t timo)
 #endif
 #ifdef PARANOID
 	if (drv->netif_get == NULL)
-		panic("%s%d: no netif_get support\n", drv->netif_bname,
+		panic("%s%d: no netif_get support", drv->netif_bname,
 		    nif->nif_unit);
 #endif
 	rv = drv->netif_get(desc, pkt, timo);
@@ -249,7 +249,7 @@ netif_put(struct iodesc *desc, void *pkt, size_t len)
 #endif
 #ifdef PARANOID
 	if (drv->netif_put == NULL)
-		panic("%s%d: no netif_put support\n", drv->netif_bname,
+		panic("%s%d: no netif_put support", drv->netif_bname,
 		    nif->nif_unit);
 #endif
 	rv = drv->netif_put(desc, pkt, len);
diff --git a/stand/libsa/sbrk.c b/stand/libsa/sbrk.c
index 00787fc54945..2f169ea60f66 100644
--- a/stand/libsa/sbrk.c
+++ b/stand/libsa/sbrk.c
@@ -53,7 +53,7 @@ sbrk(int incr)
     char	*ret;
     
     if (heapbase == 0)
-	    panic("No heap setup\n");
+	    panic("No heap setup");
 
     if ((heapsize + incr) <= maxheap) {
 	ret = (char *)heapbase + heapsize;
diff --git a/stand/uboot/lib/copy.c b/stand/uboot/lib/copy.c
index 131b88d85861..7fd5fd671c02 100644
--- a/stand/uboot/lib/copy.c
+++ b/stand/uboot/lib/copy.c
@@ -133,7 +133,7 @@ uboot_loadaddr(u_int type, void *data, uint64_t addr)
 			}
 		}
 		if (biggest_size == 0)
-			panic("Not enough DRAM to load kernel\n");
+			panic("Not enough DRAM to load kernel");
 #if 0
 		printf("Loading kernel into region 0x%08jx-0x%08jx (%ju MiB)\n",
 		    (uintmax_t)biggest_block, 
diff --git a/stand/uboot/lib/net.c b/stand/uboot/lib/net.c
index a0d1cb4f4583..2e1b9ab4caa4 100644
--- a/stand/uboot/lib/net.c
+++ b/stand/uboot/lib/net.c
@@ -324,7 +324,7 @@ net_init(struct iodesc *desc, void *machdep_hint)
 	sc = nif->nif_devdata = &uboot_softc;
 
 	if ((err = ub_dev_open(sc->sc_handle)) != 0)
-		panic("%s%d: initialisation failed with error %d\n",
+		panic("%s%d: initialisation failed with error %d",
 		    nif->nif_driver->netif_bname, nif->nif_unit, err);
 
 	/* Get MAC address */
@@ -359,6 +359,6 @@ net_end(struct netif *nif)
 	int err;
 
 	if ((err = ub_dev_close(sc->sc_handle)) != 0)
-		panic("%s%d: net_end failed with error %d\n",
+		panic("%s%d: net_end failed with error %d",
 		    nif->nif_driver->netif_bname, nif->nif_unit, err);
 }