diff --git a/pkgs/by-name/gd/gdash/package.nix b/pkgs/by-name/gd/gdash/package.nix
index d844cbb45fbe..d2498412156d 100644
--- a/pkgs/by-name/gd/gdash/package.nix
+++ b/pkgs/by-name/gd/gdash/package.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation (finalAttrs: {
     SDL2_image
   ];
 
-  env.NIX_CFLAGS_COMPILE = " -I${SDL2_image}/include/SDL2";
+  env.NIX_CFLAGS_COMPILE = " -I${lib.getInclude SDL2_image}/include/SDL2";
 
   doCheck = true;
 
diff --git a/pkgs/by-name/ta/tamatool/package.nix b/pkgs/by-name/ta/tamatool/package.nix
index 53ef7bf144fd..a3bff9f0feac 100644
--- a/pkgs/by-name/ta/tamatool/package.nix
+++ b/pkgs/by-name/ta/tamatool/package.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation (finalAttrs: {
     "-Clinux"
     "VERSION=${finalAttrs.version}"
     "CFLAGS+=-I${lib.getInclude SDL2}/include/SDL2"
-    "CFLAGS+=-I${SDL2_image}/include/SDL2"
+    "CFLAGS+=-I${lib.getInclude SDL2_image}/include/SDL2"
     "DIST_PATH=$(out)"
     "CC=${stdenv.cc.targetPrefix}cc"
   ];