diff --git a/plugins/sysinfo/unix/backend.c b/plugins/sysinfo/unix/backend.c
index 76a6f70f..dc065518 100644
--- a/plugins/sysinfo/unix/backend.c
+++ b/plugins/sysinfo/unix/backend.c
@@ -147,7 +147,7 @@ char *sysinfo_backend_get_sound(void)
 
 char *sysinfo_backend_get_uptime(void)
 {
-	guint64 uptime;
+	gint64 uptime;
 
 	if ((uptime = xs_parse_uptime ()) == 0)
 	{
diff --git a/plugins/sysinfo/unix/parse.c b/plugins/sysinfo/unix/parse.c
index 9f03533d..0ca140de 100644
--- a/plugins/sysinfo/unix/parse.c
+++ b/plugins/sysinfo/unix/parse.c
@@ -107,10 +107,10 @@ int xs_parse_cpu(char *model, char *vendor, double *freq)
 	return 0;
 }
 
-guint64 xs_parse_uptime(void)
+gint64 xs_parse_uptime(void)
 {
 	char buffer[bsize];
-	guint64 uptime = 0;
+	gint64 uptime = 0;
 	FILE *fp = fopen("/proc/uptime", "r");
 	if(fp == NULL)
 		return 0;
diff --git a/plugins/sysinfo/unix/parse.h b/plugins/sysinfo/unix/parse.h
index 89f1299c..c7cb571e 100644
--- a/plugins/sysinfo/unix/parse.h
+++ b/plugins/sysinfo/unix/parse.h
@@ -24,7 +24,7 @@
 #define _PARSE_H_
 
 int xs_parse_cpu(char *model, char *vendor, double *freq);
-guint64 xs_parse_uptime(void);
+gint64 xs_parse_uptime(void);
 int xs_parse_sound(char *snd_card);
 int xs_parse_meminfo(unsigned long long *mem_tot, unsigned long long *mem_free, int swap);
 int xs_parse_video(char *vid_card);