diff --git a/tools/munin-plugins-busybox/entropy.c b/tools/munin-plugins-busybox/entropy.c
index 4a5d8468..cc7791fd 100644
--- a/tools/munin-plugins-busybox/entropy.c
+++ b/tools/munin-plugins-busybox/entropy.c
@@ -2,6 +2,8 @@
 #include <stdio.h>
 #include "common.h"
 
+#define ENTROPY_AVAIL "/proc/sys/kernel/random/entropy_avail"
+
 int entropy(int argc, char **argv) {
 	FILE *f;
 	int entropy;
@@ -20,12 +22,12 @@ int entropy(int argc, char **argv) {
 		if(!strcmp(argv[1], "autoconf"))
 			return writeyes();
 	}
-	if(!(f=fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
-		fputs("cannot open /proc/sys/kernel/random/entropy_avail\n", stderr);
+	if(!(f=fopen(ENTROPY_AVAIL, "r"))) {
+		fputs("cannot open " ENTROPY_AVAIL "\n", stderr);
 		return 1;
 	}
 	if(1 != fscanf(f, "%d", &entropy)) {
-		fputs("cannot read from /proc/sys/kernel/random/entropy_avail\n", stderr);
+		fputs("cannot read from " ENTROPY_AVAIL "\n", stderr);
 		fclose(f);
 		return 1;
 	}
diff --git a/tools/munin-plugins-busybox/fw_packets.c b/tools/munin-plugins-busybox/fw_packets.c
index 06367dde..8e94fdea 100644
--- a/tools/munin-plugins-busybox/fw_packets.c
+++ b/tools/munin-plugins-busybox/fw_packets.c
@@ -4,6 +4,8 @@
 #include <ctype.h>
 #include "common.h"
 
+#define PROC_NET_SNMP "/proc/net/snmp"
+
 int fw_packets(int argc, char **argv) {
 	FILE *f;
 	char buff[1024], *s;
@@ -24,14 +26,14 @@ int fw_packets(int argc, char **argv) {
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {
-			if(0 == access("/proc/net/snmp", R_OK))
+			if(0 == access(PROC_NET_SNMP, R_OK))
 				return writeyes();
 			else
-				return writeno("/proc/net/snmp not readable");
+				return writeno(PROC_NET_SNMP " not readable");
 		}
 	}
-	if(!(f=fopen("/proc/net/snmp", "r"))) {
-		fputs("cannot open /proc/net/snmp\n", stderr);
+	if(!(f=fopen(PROC_NET_SNMP, "r"))) {
+		fputs("cannot open " PROC_NET_SNMP "\n", stderr);
 		return 1;
 	}
 	while(fgets(buff, 1024, f)) {
@@ -55,6 +57,6 @@ int fw_packets(int argc, char **argv) {
 		}
 	}
 	fclose(f);
-	fputs("no ip line found in /proc/net/snmp\n", stderr);
+	fputs("no ip line found in " PROC_NET_SNMP "\n", stderr);
 	return 1;
 }
diff --git a/tools/munin-plugins-busybox/load.c b/tools/munin-plugins-busybox/load.c
index c894f5e2..27e18437 100644
--- a/tools/munin-plugins-busybox/load.c
+++ b/tools/munin-plugins-busybox/load.c
@@ -3,6 +3,8 @@
 #include <stdlib.h>
 #include "common.h"
 
+#define PROC_LOADAVG "/proc/loadavg"
+
 int load(int argc, char **argv) {
 	FILE *f;
 	int warn, crit;
@@ -32,12 +34,12 @@ int load(int argc, char **argv) {
 		if(!strcmp(argv[1], "autoconf"))
 			return writeyes();
 	}
-	if(!(f=fopen("/proc/loadavg", "r"))) {
-		fputs("cannot open /proc/loadavg\n", stderr);
+	if(!(f=fopen(PROC_LOADAVG, "r"))) {
+		fputs("cannot open " PROC_LOADAVG "\n", stderr);
 		return 1;
 	}
 	if(1 != fscanf(f, "%*f %f", &val)) {
-		fputs("cannot read from /proc/loadavg\n", stderr);
+		fputs("cannot read from " PROC_LOADAVG "\n", stderr);
 		fclose(f);
 		return 1;
 	}
diff --git a/tools/munin-plugins-busybox/open_files.c b/tools/munin-plugins-busybox/open_files.c
index 3f82c8b5..9eb5c3d7 100644
--- a/tools/munin-plugins-busybox/open_files.c
+++ b/tools/munin-plugins-busybox/open_files.c
@@ -3,18 +3,21 @@
 #include <unistd.h>
 #include "common.h"
 
+#define FS_FILE_NR "/proc/sys/fs/file-nr"
+
 int open_files(int argc, char **argv) {
 	FILE *f;
 	int alloc, freeh, avail;
 	if(argc > 1) {
 		if(!strcmp(argv[1], "config")) {
-			if(!(f=fopen("/proc/sys/fs/file-nr", "r"))) {
-				fprintf(stderr, "cannot open /proc/sys/fs/file-nr\n");
+			if(!(f=fopen(FS_FILE_NR, "r"))) {
+				fprintf(stderr, "cannot open " FS_FILE_NR "\n");
 				return 1;
 			}
 			if(1 != fscanf(f, "%*d %*d %d", &avail)) {
 				fclose(f);
-				fprintf(stderr, "cannot read from /proc/sys/fs/file-nr\n");
+				fprintf(stderr, "cannot read from " FS_FILE_NR
+						"\n");
 				return 1;
 			}
 			fclose(f);
@@ -26,24 +29,27 @@ int open_files(int argc, char **argv) {
 				"used.label open files\n"
 				"used.info The number of currently open files.\n"
 				"max.label max open files\n"
-				"max.info The maximum supported number of open files. Tune by modifying /proc/sys/fs/file-max.");
-			printf("used.warning %d\nused.critical %d\n", (int)(avail*0.92), (int)(avail*0.98));
+				"max.info The maximum supported number of open "
+					"files. Tune by modifying " FS_FILE_NR
+					".");
+			printf("used.warning %d\nused.critical %d\n",
+					(int)(avail*0.92), (int)(avail*0.98));
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {
-			if(0 == access("/proc/sys/fs/file-nr", R_OK))
+			if(0 == access(FS_FILE_NR, R_OK))
 				return writeyes();
 			else
-				return writeno("/proc/sys/fs/file-nr not readable");
+				return writeno(FS_FILE_NR " not readable");
 		}
 	}
-	if(!(f=fopen("/proc/sys/fs/file-nr", "r"))) {
-		fputs("cannot open /proc/sys/fs/file-nr\n", stderr);
+	if(!(f=fopen(FS_FILE_NR, "r"))) {
+		fputs("cannot open " FS_FILE_NR "\n", stderr);
 		return 1;
 	}
 	if(3 != fscanf(f, "%d %d %d", &alloc, &freeh, &avail)) {
 		fclose(f);
-		fputs("cannot read from /proc/sys/fs/file-nr\n", stderr);
+		fputs("cannot read from " FS_FILE_NR "\n", stderr);
 		return 1;
 	}
 	fclose(f);
diff --git a/tools/munin-plugins-busybox/open_inodes.c b/tools/munin-plugins-busybox/open_inodes.c
index bc20cc60..d9e86577 100644
--- a/tools/munin-plugins-busybox/open_inodes.c
+++ b/tools/munin-plugins-busybox/open_inodes.c
@@ -3,6 +3,8 @@
 #include <unistd.h>
 #include "common.h"
 
+#define FS_INODE_NR "/proc/sys/fs/inode-nr"
+
 int open_inodes(int argc, char **argv) {
 	FILE *f;
 	int nr, freen;
@@ -21,19 +23,19 @@ int open_inodes(int argc, char **argv) {
 			return 0;
 		}
 		if(!strcmp(argv[1], "autoconf")) {
-			if(0 == access("/proc/sys/fs/inode-nr", R_OK))
+			if(0 == access(FS_INODE_NR, R_OK))
 				return writeyes();
 			else
-				return writeno("/proc/sys/fs/inode-nr not readable");
+				return writeno(FS_INODE_NR " not readable");
 		}
 	}
-	if(!(f=fopen("/proc/sys/fs/inode-nr", "r"))) {
-		fputs("cannot open /proc/sys/fs/inode-nr\n", stderr);
+	if(!(f=fopen(FS_INODE_NR, "r"))) {
+		fputs("cannot open " FS_INODE_NR "\n", stderr);
 		return 1;
 	}
 	if(2 != fscanf(f, "%d %d", &nr, &freen)) {
 		fclose(f);
-		fputs("cannot read from /proc/sys/fs/inode-nr\n", stderr);
+		fputs("cannot read from " FS_INODE_NR "\n", stderr);
 		return 1;
 	}
 	fclose(f);