diff --git a/plexers/Makefile b/plexers/Makefile
index 3de9494..18942ef 100644
--- a/plexers/Makefile
+++ b/plexers/Makefile
@@ -18,4 +18,4 @@ encoder:
 decoder:
 		gcc -I../common/ ../common/auxiliar.c decoder.c -o decoder 
 bit_selector:
-		gcc -I../common/ ../common/auxiliar.c bit_selector.c -o bit_selector 
+		gcc -I../common/ ../common/auxiliar.c bit_selector.c -o bit_selector -lm
diff --git a/plexers/decoder.c b/plexers/decoder.c
index d4ed33e..c71de47 100644
--- a/plexers/decoder.c
+++ b/plexers/decoder.c
@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include <string.h>
 #include "auxiliar.h"
-#include <math.h>
 
 int main(int argc, char **argv)
 {
diff --git a/plexers/demultiplexor.c b/plexers/demultiplexor.c
index ef52c2b..b356608 100644
--- a/plexers/demultiplexor.c
+++ b/plexers/demultiplexor.c
@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include <string.h>
 #include "auxiliar.h"
-#include <math.h>
 
 int main(int argc, char **argv)
 {
diff --git a/plexers/encoder.c b/plexers/encoder.c
index 82bbf11..0601169 100644
--- a/plexers/encoder.c
+++ b/plexers/encoder.c
@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include <string.h>
 #include "auxiliar.h"
-#include <math.h>
 
 int check_length(char **inputs, uint8_t num_inputs)
 {
diff --git a/plexers/multiplexor.c b/plexers/multiplexor.c
index f04d8dd..deabe89 100644
--- a/plexers/multiplexor.c
+++ b/plexers/multiplexor.c
@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include <string.h>
 #include "auxiliar.h"
-#include <math.h>
 
 int check_length(char **inputs, uint8_t num_inputs)
 {