diff --git a/genethumb/mygetopt.c b/genethumb/mygetopt.c
index d037e97..4c23f7e 100644
--- a/genethumb/mygetopt.c
+++ b/genethumb/mygetopt.c
@@ -27,7 +27,7 @@
 /* DOS / Kernel driver */
 #ifndef __intptr_t_defined
 #ifndef _UINTPTR_T
-typedef unsigned int		uintptr_t;
+typedef unsigned int uintptr_t;
 #endif
 #endif
 
diff --git a/pipi/codec/coreimage.m b/pipi/codec/coreimage.m
index 7852159..84cb8d2 100644
--- a/pipi/codec/coreimage.m
+++ b/pipi/codec/coreimage.m
@@ -25,7 +25,7 @@
 
 pipi_image_t *pipi_load_coreimage(const char *name)
 {
-    NSAutoreleasePool	 *autoreleasepool = [[NSAutoreleasePool alloc] init];
+    NSAutoreleasePool *autoreleasepool = [[NSAutoreleasePool alloc] init];
     NSString *n = [NSString stringWithCString: name];
     CIImage *source;
     NSURL *url = [NSURL fileURLWithPath:n];
@@ -60,7 +60,7 @@ pipi_image_t *pipi_load_coreimage(const char *name)
 
 int pipi_save_coreimage(pipi_image_t *img, const char *name)
 {
-    NSAutoreleasePool	 *autoreleasepool = [[NSAutoreleasePool alloc] init];
+    NSAutoreleasePool *autoreleasepool = [[NSAutoreleasePool alloc] init];
     printf("%d\n", img->last_modified);
     pipi_pixels_t *p = pipi_getpixels(img, PIPI_PIXELS_RGBA_C);
 
diff --git a/pipi/colorstring.c b/pipi/colorstring.c
index ad11ca0..80a90a2 100644
--- a/pipi/colorstring.c
+++ b/pipi/colorstring.c
@@ -56,7 +56,7 @@ struct color_table color_table[] =
 
 pipi_pixel_t *pipi_get_color_from_string(const char* s)
 {
-	pipi_pixel_t *color;
+    pipi_pixel_t *color;
 
     if(!s) return NULL;
 
diff --git a/pipi/histogram/histogram.c b/pipi/histogram/histogram.c
index 6795acc..82f897d 100644
--- a/pipi/histogram/histogram.c
+++ b/pipi/histogram/histogram.c
@@ -42,7 +42,7 @@ int pipi_get_image_histogram(pipi_image_t *img, pipi_histogram_t*h, int flags)
 
     if(!h) return -1;
 
-	data = (uint8_t *)pipi_getpixels(img, PIPI_PIXELS_RGBA_C)->pixels;
+    data = (uint8_t *)pipi_getpixels(img, PIPI_PIXELS_RGBA_C)->pixels;
 
     for(i=0; i< img->w*img->h*4; i+=4)
     {
diff --git a/pipi/quantize/reduce.c b/pipi/quantize/reduce.c
index 2e13b8e..cf257cf 100644
--- a/pipi/quantize/reduce.c
+++ b/pipi/quantize/reduce.c
@@ -154,7 +154,7 @@ static hull_t *compute_hull(int ncolors, double const *palette)
         for(i = 0; i < ncolors; i++)
         {
             double k1[3];
-			double yk1;
+            double yk1;
             k1[R] = pal[i][R] - p0[R];
             k1[G] = pal[i][G] - p0[G];
             k1[B] = pal[i][B] - p0[B];
@@ -170,7 +170,7 @@ static hull_t *compute_hull(int ncolors, double const *palette)
                 double k2[3];
                 double yk2, s;
 
-				if(i == j)
+                if(i == j)
                     continue;
 
                 k2[R] = pal[j][R] - p0[R];
@@ -249,7 +249,7 @@ static hull_t *compute_hull(int ncolors, double const *palette)
         /* Remove points not in the convex hull */
         for(i = 2; i < npts; /* */)
         {
-			double k1, k2;
+            double k1, k2;
 
             if(i < 2)
             {
@@ -285,7 +285,7 @@ static hull_t *compute_hull(int ncolors, double const *palette)
             double aby = pts[i - 1][Y] - pts[0][Y];
             double acx = pts[i][X] - pts[0][X];
             double acy = pts[i][Y] - pts[0][Y];
-			double area;
+            double area;
             double sqarea = (abx * abx + aby * aby) * (acx * acx + acy * acy)
                           - (abx * acx + aby * acy) * (abx * acx + aby * acy);
             if(sqarea <= 0.)
@@ -358,9 +358,9 @@ pipi_image_t *pipi_reduce(pipi_image_t *src,
     };
 
     pipi_image_t *dst;
-	pipi_pixels_t *srcp, *dstp;
-	float *srcdata, *dstdata;
-	hull_t *rgbhull, *myhull;
+    pipi_pixels_t *srcp, *dstp;
+    float *srcdata, *dstdata;
+    hull_t *rgbhull, *myhull;
     int i, j, w, h;
 
     init_uv();
diff --git a/pipi/render/screen.c b/pipi/render/screen.c
index f8222a1..b220885 100644
--- a/pipi/render/screen.c
+++ b/pipi/render/screen.c
@@ -96,7 +96,7 @@ pipi_image_t *pipi_render_halftone(int w, int h)
     for(y = 0; y < h; y++)
         for(x = 0; x < w; x++)
         {
-	    double dy = ((double)y + .07) / h - .5;
+            double dy = ((double)y + .07) / h - .5;
             double dx = (double)x / w - .5;
             /* Using dx²+dy² here creates another interesting halftone. */
             double r = - cos(M_PI * (dx - dy)) - cos(M_PI * (dx + dy));