diff --git a/source/dub/recipe/sdl.d b/source/dub/recipe/sdl.d
index 6a82abb..34dba14 100644
--- a/source/dub/recipe/sdl.d
+++ b/source/dub/recipe/sdl.d
@@ -195,7 +195,7 @@
 {
 	string platform;
 	if ("platform" in t.attributes)
-		platform = t.attributes["platform"][0].value.get!string;
+		platform = "-" ~ t.attributes["platform"][0].value.get!string;
 	foreach (v; t.values)
 		dst[platform] ~= v.get!string;
 }
@@ -204,7 +204,7 @@
 {
 	string platform;
 	if ("platform" in t.attributes)
-		platform = t.attributes["platform"][0].value.get!string;
+		platform = "-" ~ t.attributes["platform"][0].value.get!string;
 	foreach (v; t.values) {
 		if (platform !in dst) dst[platform] = Es.init;
 		dst[platform] |= v.get!string.to!E;