diff --git a/classify.c b/classify.c
index 271e50c..f73b2f4 100644
--- a/classify.c
+++ b/classify.c
@@ -180,15 +180,15 @@ static struct irq_info *add_one_irq_to_db(const char *devpath, int irq, struct u
 
 get_numa_node:
 	numa_node = -1;
-	sprintf(path, "%s/numa_node", devpath);
-	fd = fopen(path, "r");
-	if (!fd)
-		goto assign_node;
+	if (numa_avail) {
+		sprintf(path, "%s/numa_node", devpath);
+		fd = fopen(path, "r");
+		if (fd) {
+			rc = fscanf(fd, "%d", &numa_node);
+			fclose(fd);
+		}
+	}
 
-	rc = fscanf(fd, "%d", &numa_node);
-	fclose(fd);
-
-assign_node:
 	if (pol->numa_node_set == 1)
 		new->numa_node = get_numa_node(pol->numa_node);
 	else
diff --git a/cputree.c b/cputree.c
index b7aa7b8..caedbb6 100644
--- a/cputree.c
+++ b/cputree.c
@@ -261,17 +261,19 @@ static void do_one_cpu(char *path)
 	}
 
 	nodeid=-1;
-	dir = opendir(path);
-	do {
-		entry = readdir(dir);
-		if (!entry)
-			break;
-		if (strstr(entry->d_name, "node")) {
-			nodeid = strtoul(&entry->d_name[4], NULL, 10);
-			break;
-		}
-	} while (entry);
-	closedir(dir);
+	if (numa_avail) {
+		dir = opendir(path);
+		do {
+			entry = readdir(dir);
+			if (!entry)
+				break;
+			if (strstr(entry->d_name, "node")) {
+				nodeid = strtoul(&entry->d_name[4], NULL, 10);
+				break;
+			}
+		} while (entry);
+		closedir(dir);
+	}
 
 	/*
 	   blank out the banned cpus from the various masks so that interrupts
diff --git a/numa.c b/numa.c
index 1820fbe..ff3f169 100644
--- a/numa.c
+++ b/numa.c
@@ -89,7 +89,7 @@ static void add_one_node(const char *nodename)
 
 void build_numa_node_list(void)
 {
-	DIR *dir = opendir(SYSFS_NODE_PATH);
+	DIR *dir;
 	struct dirent *entry;
 
 	/*
@@ -104,6 +104,10 @@ void build_numa_node_list(void)
 	 */
 	numa_nodes = g_list_append(numa_nodes, &unspecified_node);
 
+	if (!numa_avail)
+		return;
+
+	dir = opendir(SYSFS_NODE_PATH);
 	if (!dir)
 		return;