diff --git a/documentation/ChangeLog.md b/documentation/ChangeLog.md
index 01efaa321..c10a32132 100644
--- a/documentation/ChangeLog.md
+++ b/documentation/ChangeLog.md
@@ -1,6 +1,7 @@
 ## release ChangeLog
 
 ### (NextVersion)
+ * Fixed: when invoking toolchain programs, add tool directory to beginning of PATH, not end.
  * Fixed: In Linux, the "Build Target" group UI widget height is broken, too short. (#150)
  * Fixed: if build tool reports many error messages, the Eclipse project build will take too long to finish.
  * Added UserGuide note about using Homebrew GDB in OS X.
diff --git a/plugin_tooling/src-lang/melnorme/lang/utils/ProcessUtils.java b/plugin_tooling/src-lang/melnorme/lang/utils/ProcessUtils.java
index bd1502679..d53b80b8b 100644
--- a/plugin_tooling/src-lang/melnorme/lang/utils/ProcessUtils.java
+++ b/plugin_tooling/src-lang/melnorme/lang/utils/ProcessUtils.java
@@ -22,6 +22,7 @@
 import melnorme.utilbox.core.CommonException;
 import melnorme.utilbox.misc.Location;
 import melnorme.utilbox.misc.MiscUtil;
+import melnorme.utilbox.misc.StringUtil;
 
 public class ProcessUtils {
 	
@@ -69,10 +70,9 @@ public static void addDirToPathEnv(Path cmdExePath, ProcessBuilder pb) {
 			return;
 		}
 		
-		pathEnv = (pathEnv == null) ? "" : pathEnv + File.pathSeparator;
-		pathEnv += cmdDir.toString();
+		String newPathEnv = cmdDir.toString() + File.pathSeparator + StringUtil.nullAsEmpty(pathEnv);
 		
-		putVarInEnvMap(environment, "PATH", pathEnv);
+		putVarInEnvMap(environment, "PATH", newPathEnv);
 	}
 	
 	public static String getVarFromEnvMap(Map<String, String> envMap, String key) {