diff --git a/libdevcheck/libdevcheck.c b/libdevcheck/libdevcheck.c
index 4784518..f8c8eb1 100644
--- a/libdevcheck/libdevcheck.c
+++ b/libdevcheck/libdevcheck.c
@@ -98,25 +98,23 @@ DC_Dev *dc_dev_list_get_entry(DC_DevList *list, int index) {
     return dev;
 }
 
+static int is_whole_disk(const char *name) {
+    // SD cards have "mmcblkN" for whole devices,
+    // and "mmcblkNpM" for partitions
+    if (!strncmp(name, "mmcblk", 6)) {
+        return !strchr(name + 6, 'p');
+    }
+    // taken from util-linux-2.19.1/lib/wholedisk.c
+    while (*name)
+        name++;
+    return !isdigit(name[-1]);
+}
 
 /*
  * try all things in /proc/partitions that look like a full disk
  * Taken from util-linux-2.19.1/fdisk/fdisk.c tryprocpt()
  */
 static void dev_list_build(DC_DevList *dc_devlist) {
-
-    int is_whole_disk(const char *name) {
-        // SD cards have "mmcblkN" for whole devices,
-        // and "mmcblkNpM" for partitions
-        if (!strncmp(name, "mmcblk", 6)) {
-            return !strchr(name + 6, 'p');
-        }
-        // taken from util-linux-2.19.1/lib/wholedisk.c
-        while (*name)
-            name++;
-        return !isdigit(name[-1]);
-    }
-
 	FILE *procpt;
 	char line[128], ptname[128];
 	int ma, mi;