diff --git test/CMakeLists.txt test/CMakeLists.txt
index 8e4b4d1..0aff1eb 100644
--- test/CMakeLists.txt
+++ test/CMakeLists.txt
@@ -9,6 +9,6 @@ include_directories(../src/common/)
 foreach(TEST_NAME cpu disk memory network process swap)
 	add_executable(${TEST_NAME} test_${TEST_NAME}.c)
 	add_dependencies(${TEST_NAME} sysactivity)
-	target_link_libraries(${TEST_NAME} sysactivity pthread)
+	target_link_libraries(${TEST_NAME} sysactivity pthread m)
 	add_test(${TEST_NAME} ${TEST_NAME})
 endforeach(TEST_NAME)
diff --git test/test_cpu.c test/test_cpu.c
index 69d9ceb..c9cfaf7 100644
--- test/test_cpu.c
+++ test/test_cpu.c
@@ -23,6 +23,7 @@
 #include <pthread.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>

 #include "libsysactivity.h"

@@ -60,6 +61,7 @@ void print_cpu_info(struct sa_cpu* cpu) {
 }

 void check_range(float cpu_time) {
+	cpu_time = roundf(cpu_time);
 	if (cpu_time > 100.0 || cpu_time < 0.0) {
 		printf("%s:%d ERROR: cpu time out of range: %f\n", __FILE__, __LINE__, cpu_time);
 		error = 1;