diff --git a/liba/Makefile b/liba/Makefile
index 5003c691c..7893b8a3d 100644
--- a/liba/Makefile
+++ b/liba/Makefile
@@ -2,4 +2,4 @@ SFLAGS += -Iliba/include
 
 liba/src/external/sqlite/mem5.o: CFLAGS += -w
 
-objs += $(addprefix liba/src/, assert.o errno.o malloc.o memcpy.o memset.o external/sqlite/mem5.o)
+objs += $(addprefix liba/src/, assert.o errno.o malloc.o memcpy.o memset.o strlen.o external/sqlite/mem5.o)
diff --git a/liba/include/string.h b/liba/include/string.h
index 929b69733..0f3e325ab 100644
--- a/liba/include/string.h
+++ b/liba/include/string.h
@@ -10,7 +10,6 @@ LIBA_BEGIN_DECLS
 
 void * memcpy(void * dst, const void * src, size_t n);
 void * memset(void * b, int c, size_t len);
-
 size_t strlen(const char * s);
 
 LIBA_END_DECLS
diff --git a/liba/src/strlen.c b/liba/src/strlen.c
new file mode 100644
index 000000000..68fd1b576
--- /dev/null
+++ b/liba/src/strlen.c
@@ -0,0 +1,8 @@
+#include <string.h>
+
+size_t strlen(const char * s) {
+  const char * str = s;
+  while (*str)
+    str++;
+  return str - s;
+}
diff --git a/platform/fx92kbd/fx92kbd.c b/platform/fx92kbd/fx92kbd.c
index 5d295e5e5..0c2a9b07d 100644
--- a/platform/fx92kbd/fx92kbd.c
+++ b/platform/fx92kbd/fx92kbd.c
@@ -9,7 +9,7 @@ void fx92kbd_initialize(fx92kbd_t * controller) {
 }
 
 //FIXME!
-static int delay(int usec) {
+static void delay(int usec) {
   for (int i=0; i<usec; i++) {
   }
 }
diff --git a/platform/stm32f429/init_kbd.c b/platform/stm32f429/init_kbd.c
index 3cc2d995e..c5727a119 100644
--- a/platform/stm32f429/init_kbd.c
+++ b/platform/stm32f429/init_kbd.c
@@ -34,8 +34,8 @@ static void row_write(uint8_t row) {
   }
 }
 
-static uint16_t column_read() {
-  uint16_t output_value = 0;
+static uint8_t column_read() {
+  uint8_t output_value = 0;
   size_t column_length = sizeof(column_pins)/sizeof(column_pins[0]);
   for (int i=0; i<column_length; i++) {
     gpio_pin_t pin = column_pins[i];
diff --git a/platform/stm32f429/init_lcd.c b/platform/stm32f429/init_lcd.c
index 46811c1be..a000c3445 100644
--- a/platform/stm32f429/init_lcd.c
+++ b/platform/stm32f429/init_lcd.c
@@ -275,7 +275,7 @@ static void init_rgb_layers() {
 
   LTDC_LPFCR(LTDC_LAYER1) = LTDC_PF_L8;
 
-  LTDC_LCFBAR(LTDC_LAYER1) = Platform.framebuffer_address;
+  LTDC_LCFBAR(LTDC_LAYER1) = (uint32_t)Platform.framebuffer_address;
 
   LTDC_LCFBLR(LTDC_LAYER1) =
     LTDC_CFBLL(Platform.framebuffer_width + 3) | // Number of bytes per lines in the framebuffer. 240 * 4 (RGBA888). +3, per doc;
diff --git a/poincare/src/expression.cpp b/poincare/src/expression.cpp
index fd23049f2..f4eb90ce6 100644
--- a/poincare/src/expression.cpp
+++ b/poincare/src/expression.cpp
@@ -9,7 +9,6 @@ void CreateFromString(char * string) {
   YY_BUFFER_STATE buf;
   poincare_expression_yylex_init(&scanner);
   buf = poincare_expression_yy_scan_string(string, scanner);
-  void * selector = 0;
   Expression * expression = 0;
   poincare_expression_yyparse(scanner, &expression);