diff --git a/gfx/video_filters/epx.c b/gfx/video_filters/epx.c
index 4b5d32f4de..f3a7c986e4 100644
--- a/gfx/video_filters/epx.c
+++ b/gfx/video_filters/epx.c
@@ -122,7 +122,7 @@ static void epx_generic_rgb565 (unsigned width, unsigned height,
       dP1 = (uint32_t *) dst;
       dP2 = (uint32_t *) (dst + dst_stride);
 
-      // left edge
+      /* left edge */
 
       colorX = *sP;
       colorC = *++sP;
@@ -145,8 +145,6 @@ static void epx_generic_rgb565 (unsigned width, unsigned height,
       dP1++;
       dP2++;
 
-      //
-
       for (w = width - 2; w; w--)
       {
          colorA = colorX;
@@ -172,7 +170,7 @@ static void epx_generic_rgb565 (unsigned width, unsigned height,
          dP2++;
       }
 
-      // right edge
+      /* right edge */
 
       colorA = colorX;
       colorX = colorC;
diff --git a/gfx/video_filters/scale2x.c b/gfx/video_filters/scale2x.c
index bf08dc589f..733f9c8f80 100644
--- a/gfx/video_filters/scale2x.c
+++ b/gfx/video_filters/scale2x.c
@@ -14,7 +14,7 @@
  *  If not, see <http://www.gnu.org/licenses/>.
  */
 
-// Compile: gcc -o scale2x.so -shared scale2x.c -std=c99 -O3 -Wall -pedantic -fPIC
+/* Compile: gcc -o scale2x.so -shared scale2x.c -std=c99 -O3 -Wall -pedantic -fPIC */
 
 #include "softfilter.h"
 #include <stdlib.h>
diff --git a/gfx/video_filters/super2xsai.c b/gfx/video_filters/super2xsai.c
index 2546cef57c..70e670640d 100644
--- a/gfx/video_filters/super2xsai.c
+++ b/gfx/video_filters/super2xsai.c
@@ -14,7 +14,7 @@
  *  If not, see <http://www.gnu.org/licenses/>.
  */
 
-// Compile: gcc -o supertwoxsai.so -shared supertwoxsai.c -std=c99 -O3 -Wall -pedantic -fPIC
+/* Compile: gcc -o supertwoxsai.so -shared supertwoxsai.c -std=c99 -O3 -Wall -pedantic -fPIC */
 
 #include "softfilter.h"
 #include <stdlib.h>
diff --git a/gfx/video_filters/supereagle.c b/gfx/video_filters/supereagle.c
index 980d6483fc..d1af9b1597 100644
--- a/gfx/video_filters/supereagle.c
+++ b/gfx/video_filters/supereagle.c
@@ -14,7 +14,7 @@
  *  If not, see <http://www.gnu.org/licenses/>.
  */
 
-// Compile: gcc -o supereagle.so -shared supereagle.c -std=c99 -O3 -Wall -pedantic -fPIC
+/* Compile: gcc -o supereagle.so -shared supereagle.c -std=c99 -O3 -Wall -pedantic -fPIC */
 
 #include "softfilter.h"
 #include <stdlib.h>
@@ -308,7 +308,7 @@ static void supereagle_generic_packets(void *data,
       thr->width = width;
       thr->height = y_end - y_start;
 
-      // Workers need to know if they can access pixels outside their given buffer.
+      /* Workers need to know if they can access pixels outside their given buffer. */
       thr->first = y_start;
       thr->last = y_end == height;