diff --git a/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs b/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs
index 088df5b8a..891611c91 100644
--- a/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs
+++ b/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs
@@ -71,6 +71,8 @@ namespace ICSharpCode.Decompiler.Metadata
 				decompilerRuntime = DecompilerRuntime.NETCoreApp;
 			else if (Environment.OSVersion.Platform == PlatformID.Unix)
 				decompilerRuntime = DecompilerRuntime.Mono;
+			else
+				decompilerRuntime = DecompilerRuntime.NETFramework;
 		}
 
 		readonly Lazy<DotNetCorePathFinder> dotNetCorePathFinder;
@@ -464,6 +466,20 @@ namespace ICSharpCode.Decompiler.Metadata
 					return assembly;
 			}
 
+			if (decompilerRuntime == DecompilerRuntime.NETCoreApp)
+			{
+				// Hosts without a .NET Framework installation (e.g. Linux, macOS) have no GAC;
+				// the only system-wide assembly store there is the shared-framework directory
+				// of the runtime executing the decompiler. Search it as the last resort,
+				// regardless of the requested version (the runtime itself rolls forward in the
+				// same way). Without this, e.g. the type-forwards of a netstandard facade
+				// (pointing to a versioned System.Runtime) are unresolvable on such hosts.
+				string runtimeDir = Path.GetDirectoryName(typeof(object).Module.FullyQualifiedName)!;
+				assembly = SearchDirectory(name, runtimeDir);
+				if (assembly != null)
+					return assembly;
+			}
+
 			if (throwOnError)
 				throw new ResolutionException(name, null, null);
 			return null;