diff --git a/Makefile b/Makefile
index c46e797..e53c544 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 CXX=gcc
 
-CXXFLAGS=-g -Wall -Werror -fstack-protector-all -pedantic -Wno-unused
+CXXFLAGS=-g -Wall -Wextra -Werror -fstack-protector-all -pedantic -Wno-unused
+SANITY_FLAGS=-Wfloat-equal -Wshadow -Wpointer-arith -Wstrict-overflow=5 -Wformat=2
 
 SOURCE=main.c standart.c extended.c cpuid.c udev.c printer.c args.c global.c
 HEADERS=standart.h extended.h cpuid.h udev.h printer.h ascii.h args.h global.h
@@ -8,7 +9,7 @@ HEADERS=standart.h extended.h cpuid.h udev.h printer.h ascii.h args.h global.h
 OUTPUT=cpufetch
 
 $(OUTPUT): Makefile $(SOURCE) $(HEADERS)
-	$(CXX) $(CXXFLAGS) $(SOURCE) -o $(OUTPUT)
+	$(CXX) $(CXXFLAGS) $(SANITY_FLAGS) $(SOURCE) -o $(OUTPUT)
 
 run:
 	./$(OUTPUT)
diff --git a/standart.c b/standart.c
index 2a80da4..be9a13b 100644
--- a/standart.c
+++ b/standart.c
@@ -49,9 +49,9 @@ struct cpuInfo {
   /*** Threads per core(Intel HyperThreading) ***/
   int HT;
   /*** Max CPUIDs levels ***/
-  int maxLevels;
+  unsigned maxLevels;
   /*** Max CPUIDs extended levels ***/
-  int maxExtendedLevels;
+  unsigned maxExtendedLevels;
 };
 
 void initializeCpuInfo(struct cpuInfo* cpu) {
@@ -224,7 +224,7 @@ char* getPeakPerformance(struct cpuInfo* cpu, long freq) {
   ***/
 
   //7 for GFLOP/s and 6 for digits,eg 412.14
-  int size = 7+6+1+1;
+  unsigned int size = 7+6+1+1;
   assert(strlen(STRING_UNKNOWN)+1 <= size);
   char* string = malloc(sizeof(char)*size);
 
diff --git a/udev.c b/udev.c
index c114a02..ca69027 100644
--- a/udev.c
+++ b/udev.c
@@ -161,7 +161,7 @@ char* getString_L3(struct cache* cach) {
 
 char* getString_MaxFrequency(struct frequency* freq) {
   //Max 3 digits and 3 for '(M/G)Hz' plus 1 for '\0'
-  int size = (4+3+1);
+  unsigned int size = (4+3+1);
   assert(strlen(STRING_UNKNOWN)+1 <= size);
   char* string = malloc(sizeof(char)*size);
   if(freq->max == UNKNOWN)