diff --git a/source/dub/commandline.d b/source/dub/commandline.d
index 140dbef..3b761de 100644
--- a/source/dub/commandline.d
+++ b/source/dub/commandline.d
@@ -899,7 +899,7 @@
 					fmt = rawfmt.to!PackageFormat;
 					break;
 				} catch (Exception) {
-					logError("Invalid format, \""~rawfmt~"\", enter either \"sdl\" or \"json\".");
+					logError(`Invalid format '%s', enter either 'sdl' or 'json'.`, rawfmt);
 				}
 			}
 			auto author = p.authors.join(", ");
@@ -909,7 +909,7 @@
 				auto nameRegex = regex(`^[a-z0-9\-_]+$`);
 				string triedName = input("Name", p.name);
 				if (triedName.matchFirst(nameRegex).empty) {
-					logError("Invalid name, \""~triedName~"\", names should consist only of lowercase alphanumeric characters, - and _.");
+					logError(`Invalid name '%s', names should consist only of lowercase alphanumeric characters, dashes ('-') and underscores ('_').`, triedName);
 				} else {
 					p.name = triedName;
 					break;
diff --git a/source/dub/internal/utils.d b/source/dub/internal/utils.d
index 345385b..c53d708 100644
--- a/source/dub/internal/utils.d
+++ b/source/dub/internal/utils.d
@@ -683,6 +683,6 @@
 string getModuleNameFromFile(string filePath) {
 	string fileContent = filePath.readText;
 
-	logDiagnostic("Get module name from path: " ~ filePath);
+	logDiagnostic("Get module name from path: %s", filePath);
 	return getModuleNameFromContent(fileContent);
 }
diff --git a/source/dub/packagemanager.d b/source/dub/packagemanager.d
index cb637bd..31990f7 100644
--- a/source/dub/packagemanager.d
+++ b/source/dub/packagemanager.d
@@ -585,7 +585,7 @@
 
 		logDebug("About to delete root folder for package '%s'.", pack.path);
 		rmdirRecurse(pack.path.toNativeString());
-		logInfo("Removed package: '"~pack.name~"'");
+		logInfo("Removed package: '%s'", pack.name);
 	}
 
 	/// Compatibility overload. Use the version without a `force_remove` argument instead.
diff --git a/source/dub/packagesuppliers/filesystem.d b/source/dub/packagesuppliers/filesystem.d
index 9cfb55e..fa752bd 100644
--- a/source/dub/packagesuppliers/filesystem.d
+++ b/source/dub/packagesuppliers/filesystem.d
@@ -42,7 +42,7 @@
 	{
 		import dub.internal.vibecompat.core.file : copyFile, existsFile;
 		enforce(path.absolute);
-		logInfo("Storing package '"~packageId~"', version requirements: %s", dep);
+		logInfo("Storing package '%s', version requirements: %s", packageId, dep);
 		auto filename = bestPackageFile(packageId, dep, pre_release);
 		enforce(existsFile(filename));
 		copyFile(filename, path);