diff --git a/s3l.h b/s3l.h
index dedbc45..ba0eb87 100644
--- a/s3l.h
+++ b/s3l.h
@@ -1421,6 +1421,10 @@ void _S3L_drawFilledTriangle(
 
         *barycentric1 =
           S3L_interpolateByUnitFrom0(lT,S3L_FRACTIONS_PER_UNIT - rowT);
+
+  #if S3L_COMPUTE_DEPTH
+        p->depth = S3L_interpolateByUnit(lDepth,rDepth,rowT);
+  #endif
 #else
         *barycentric0 = S3L_getFastLerpValue(b0FLS);
         *barycentric1 = S3L_getFastLerpValue(b1FLS);
diff --git a/testSDL.c b/testSDL.c
index dde4d92..78857cd 100644
--- a/testSDL.c
+++ b/testSDL.c
@@ -13,7 +13,7 @@
 #define S3L_RESOLUTION_Y 480
 
 #define S3L_COMPUTE_DEPTH 1
-#define S3L_PERSPECTIVE_CORRECTION 0
+#define S3L_PERSPECTIVE_CORRECTION 1
 
 #include "s3l.h"