diff --git a/src/battle/ai.h b/src/battle/ai.h
index 991957a..dc45dd1 100644
--- a/src/battle/ai.h
+++ b/src/battle/ai.h
@@ -27,7 +27,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define TURN_SPEED 		4
 #define TURN_THRESHOLD 	2
 
-extern int mod(int n, int x);
+extern float mod(float n, float x);
 extern int getDistance(int x1, int y1, int x2, int y2);
 extern void fireGuns(Entity *owner);
 extern void fireMissile(Entity *owner);
diff --git a/src/battle/bullets.h b/src/battle/bullets.h
index 5a2841a..f88940f 100644
--- a/src/battle/bullets.h
+++ b/src/battle/bullets.h
@@ -36,7 +36,7 @@ extern long lookup(char *name);
 extern char *readFile(char *filename);
 extern float getAngle(int x1, int y1, int x2, int y2);
 extern void addMissileEngineEffect(Bullet *b);
-extern int mod(int n, int x);
+extern float mod(float n, float x);
 extern void addMissileExplosion(Bullet *b);
 extern Entity **getAllEntsWithin(int x, int y, int w, int h, Entity *ignore);
 extern void drawText(int x, int y, int size, int align, SDL_Color c, const char *format, ...);
diff --git a/src/battle/player.h b/src/battle/player.h
index 6478364..c03caa8 100644
--- a/src/battle/player.h
+++ b/src/battle/player.h
@@ -29,7 +29,7 @@ extern void applyFighterThrust(void);
 extern void applyFighterBrakes(void);
 extern int getDistance(int x1, int y1, int x2, int y2);
 extern void addHudMessage(SDL_Color c, char *format, ...);
-extern int mod(int n, int x);
+extern float mod(float n, float x);
 extern void playSound(int id);
 extern void failMission(void);
 extern float getAngle(int x1, int y1, int x2, int y2);
diff --git a/src/system/util.c b/src/system/util.c
index 8282828..862642d 100644
--- a/src/system/util.c
+++ b/src/system/util.c
@@ -20,9 +20,9 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 #include "util.h"
 
-int mod(int n, int x)
+float mod(float n, float x)
 {
-	return ((n % x) + x) % x;
+	return fmod(fmod(n, x) + x, x);
 }
 
 int rrnd(int low, int high)
diff --git a/src/system/widgets.h b/src/system/widgets.h
index b889086..a3444f6 100644
--- a/src/system/widgets.h
+++ b/src/system/widgets.h
@@ -25,7 +25,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 extern void drawText(int x, int y, int size, int align, SDL_Color c, const char *format, ...);
 extern char *readFile(char *filename);
 extern long lookup(char *name);
-extern int mod(int n, int x);
+extern float mod(float n, float x);
 extern void blit(SDL_Texture *texture, int x, int y, int centered);
 extern SDL_Texture *getTexture(char *filename);
 extern int collision(int x1, int y1, int w1, int h1, int x2, int y2, int w2, int h2);