diff --git a/app/app.cpp b/app/app.cpp
index d1c9814da..1a8854e54 100644
--- a/app/app.cpp
+++ b/app/app.cpp
@@ -73,7 +73,7 @@ static void interactive_expression_parsing() {
       }
       delete e;
     } else {
-      KDDrawString("PARSING ERROR", KDPointMake(10,10));
+      KDDrawString("PARSING ERROR", KDPointMake(10,10), 0);
     }
     // We dealocate the memory allocated by get_text;
     free(text_input);
diff --git a/app/utils.cpp b/app/utils.cpp
index f0e1c16d4..62ef83a00 100644
--- a/app/utils.cpp
+++ b/app/utils.cpp
@@ -30,8 +30,8 @@ static void print_prompt(char* text, int index) {
   KDSize font_size = KDStringSize(tmp);
   KDDrawLine(KDPointMake(0, SCREEN_HEIGHT - PROMPT_HEIGHT),
              KDPointMake(SCREEN_WIDTH, SCREEN_HEIGHT - PROMPT_HEIGHT), 0xff);
-  KDDrawString(text, KDPointMake(0, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)));
-  KDDrawInverseChar(text[index], KDPointMake(index * font_size.width, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)));
+  KDDrawString(text, KDPointMake(0, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)), 0);
+  KDDrawChar(text[index], KDPointMake(index * font_size.width, SCREEN_HEIGHT - (PROMPT_HEIGHT / 2)), true);
 }
 
 char* get_text() {
diff --git a/kandinsky/include/kandinsky/text.h b/kandinsky/include/kandinsky/text.h
index 7a88d3051..955fc0755 100644
--- a/kandinsky/include/kandinsky/text.h
+++ b/kandinsky/include/kandinsky/text.h
@@ -3,9 +3,8 @@
 
 #include <kandinsky/types.h>
 
-void KDDrawChar(char character, KDPoint p);
-void KDDrawInverseChar(char character, KDPoint p);
-void KDDrawString(const char * text, KDPoint p);
+void KDDrawChar(char character, KDPoint p, uint8_t inverse);
+void KDDrawString(const char * text, KDPoint p, uint8_t inverse);
 KDSize KDStringSize(char * text);
 
 #endif
diff --git a/kandinsky/src/text.c b/kandinsky/src/text.c
index 0563743d0..9520b0890 100644
--- a/kandinsky/src/text.c
+++ b/kandinsky/src/text.c
@@ -3,26 +3,21 @@
 #include <string.h>
 #include "font.h"
 
-void KDDrawChar(char character, KDPoint p) {
+void KDDrawChar(char character, KDPoint p, uint8_t inverse) {
   for (int j=0; j<BITMAP_FONT_CHARACTER_HEIGHT;j++) {
     for (int i=0; i<BITMAP_FONT_CHARACTER_WIDTH;i++) {
-      KDSetPixel(KDPointMake(p.x+i, p.y+j), 0xFF-bitmapFont[character-BITMAP_FONT_FIRST_CHARACTER][j][i]);
+      uint8_t intensity = inverse ?
+        bitmapFont[character-BITMAP_FONT_FIRST_CHARACTER][j][i] :
+        (0xFF-bitmapFont[character-BITMAP_FONT_FIRST_CHARACTER][j][i]);
+      KDSetPixel(KDPointMake(p.x+i, p.y+j), intensity);
     }
   }
 }
 
-void KDDrawInverseChar(char character, KDPoint p) {
-  for (int j=0; j<BITMAP_FONT_CHARACTER_HEIGHT;j++) {
-    for (int i=0; i<BITMAP_FONT_CHARACTER_WIDTH;i++) {
-      KDSetPixel(KDPointMake(p.x+i, p.y+j), bitmapFont[character-BITMAP_FONT_FIRST_CHARACTER][j][i]);
-    }
-  }
-}
-
-void KDDrawString(const char * text, KDPoint p) {
+void KDDrawString(const char * text, KDPoint p, uint8_t inverse) {
   KDPoint position = p;
   while(*text != 0) {
-    KDDrawChar(*text, position);
+    KDDrawChar(*text, position, inverse);
     text++;
     position.x += BITMAP_FONT_CHARACTER_WIDTH;
   }
diff --git a/poincare/src/layout/string_layout.cpp b/poincare/src/layout/string_layout.cpp
index 52de8df98..51e20d7f9 100644
--- a/poincare/src/layout/string_layout.cpp
+++ b/poincare/src/layout/string_layout.cpp
@@ -2,11 +2,12 @@
 #include <stdlib.h>
 #include "string_layout.h"
 
-StringLayout::StringLayout(const char * string, size_t length) :
+StringLayout::StringLayout(const char * string, size_t length, uint8_t inverse) :
 ExpressionLayout() {
   assert(string[length] == 0); // Assert NULL-termination
   m_string = (char *)malloc(sizeof(char)*(length+1));
   memcpy(m_string, string, (length+1));
+  m_inverse = inverse;
 }
 
 StringLayout::~StringLayout() {
@@ -18,7 +19,7 @@ ExpressionLayout * StringLayout::child(uint16_t index) {
 }
 
 void StringLayout::render(KDPoint point) {
-  KDDrawString(m_string, point);
+  KDDrawString(m_string, point, m_inverse);
 }
 
 KDPoint StringLayout::positionOfChild(ExpressionLayout * child) {
diff --git a/poincare/src/layout/string_layout.h b/poincare/src/layout/string_layout.h
index 0c5de9546..edaed8e3b 100644
--- a/poincare/src/layout/string_layout.h
+++ b/poincare/src/layout/string_layout.h
@@ -6,7 +6,10 @@
 
 class StringLayout : public ExpressionLayout {
   public:
-    StringLayout(const char * string, size_t length);
+    // Here the inverse is a uint8_t instead of a bool, because the size of a bool is
+    // not standardized, thus since we call a foreign C function with this value we want to be
+    // sure about compatibility.
+    StringLayout(const char * string, size_t length, uint8_t inverse=0);
     ~StringLayout();
   protected:
     void render(KDPoint point) override;
@@ -15,6 +18,7 @@ class StringLayout : public ExpressionLayout {
     KDPoint positionOfChild(ExpressionLayout * child) override;
   private:
     char * m_string;
+    bool m_inverse;
 };
 
 #endif
diff --git a/quiz/src/runner.c b/quiz/src/runner.c
index bb76367cb..7fc170be2 100644
--- a/quiz/src/runner.c
+++ b/quiz/src/runner.c
@@ -6,7 +6,7 @@
 void print(char * message) {
   static int line_y = 0;
   int line_height = KDStringSize("M").height;
-  KDDrawString(message, (KDPoint){.x = 0, .y = line_y});
+  KDDrawString(message, (KDPoint){.x = 0, .y = line_y}, 0);
   line_y += line_height;
   if (line_y > SCREEN_HEIGHT) {
     line_y = 0;