diff --git a/include/lib/libcpumf.h b/include/lib/libcpumf.h
index 37c07e50..3a338bd4 100644
--- a/include/lib/libcpumf.h
+++ b/include/lib/libcpumf.h
@@ -13,7 +13,7 @@
 #define	S390_CPUMF_CF		"/sys/devices/cpum_cf/"
 #define	S390_CPUMF_CFDIAG	"/sys/devices/cpum_cf_diag/"
 #define	S390_CPUMF_SF		"/sys/devices/cpum_sf/"
-#define S390_CPUS_ONLINE	"/sys/devices/system/cpu/online"
+#define S390_CPUS_ONLINE	"devices/system/cpu/online"
 #define S390_CPUMSF_BUFFERSZ	"/sys/module/kernel/parameters/cpum_sfb_size"
 #define S390_SYSFS_PAI_CRYPTO	"/sys/devices/pai_crypto/"
 #define S390_SYSFS_PAI_EXT	"/sys/devices/pai_ext/"
diff --git a/libcpumf/libcpumf_cpuset.c b/libcpumf/libcpumf_cpuset.c
index 38a8ebbc..2d650724 100644
--- a/libcpumf/libcpumf_cpuset.c
+++ b/libcpumf/libcpumf_cpuset.c
@@ -14,6 +14,7 @@
 #include "lib/libcpumf.h"
 #include "lib/util_file.h"
 #include "lib/util_libc.h"
+#include "lib/util_path.h"
 
 int libcpumf_cpuset(const char *parm, cpu_set_t *mask)
 {
@@ -60,9 +61,11 @@ out:
 
 int libcpumf_cpuset_fn(const char *filename, cpu_set_t *mask)
 {
+	char *path = util_path_sysfs(filename);
 	char txt[PATH_MAX];
-	int ret = util_file_read_line(txt, sizeof(txt), "%s", filename);
+	int ret = util_file_read_line(txt, sizeof(txt), "%s", path);
 
+	free(path);
 	/* Read out file, one line expected */
 	if (!ret)
 		ret = libcpumf_cpuset(txt, mask);