diff --git a/fiv-master.nix b/fiv-master.nix
index 7c549a2..c182be8 100644
--- a/fiv-master.nix
+++ b/fiv-master.nix
@@ -24,6 +24,7 @@ pkgs.stdenv.mkDerivation rec {
 		gtk3
 		libwebp
 		libraw
+		shared-mime-info
 
 		# WIP
 		libepoxy
@@ -76,10 +77,12 @@ pkgs.stdenv.mkDerivation rec {
 	];
 
 	# See nixpkgs commit b1e73fa2e086f1033a33d93524ae2a1781d12b95 about icons.
-	# It used to work automatically.
+	# It might make sense to name {hicolor,gnome.adwaita}-icon-theme/share
+	# explicitly, to limit undesired dependencies.
 	preFixup = ''
 		gappsWrapperArgs+=(
 			--prefix XDG_DATA_DIRS : "$XDG_ICON_DIRS"
+			--prefix XDG_DATA_DIRS : "${pkgs.shared-mime-info}/share"
 			--prefix PATH : $out/bin:${pkgs.lib.makeBinPath [ pkgs.exiftool ]}
 		)
 	'';
diff --git a/logdiag-master.nix b/logdiag-master.nix
index 6f06748..679e31d 100644
--- a/logdiag-master.nix
+++ b/logdiag-master.nix
@@ -55,7 +55,8 @@ pkgs.stdenv.mkDerivation rec {
 	];
 
 	# See nixpkgs commit b1e73fa2e086f1033a33d93524ae2a1781d12b95 about icons.
-	# It used to work automatically.
+	# It might make sense to name {hicolor,gnome.adwaita}-icon-theme/share
+	# explicitly, to limit undesired dependencies.
 	preFixup = ''
 		gappsWrapperArgs+=(
 			--prefix XDG_DATA_DIRS : "$XDG_ICON_DIRS"