diff --git a/pandora_agents/win32/ChangeLog b/pandora_agents/win32/ChangeLog
index 4bc58422ff..ba879aed07 100644
--- a/pandora_agents/win32/ChangeLog
+++ b/pandora_agents/win32/ChangeLog
@@ -1,3 +1,8 @@
+2012-01-04  Ramon Novoa  <rnovoa@artica.es>
+
+	* modules/pandora_module.cc: Fixed an error when checking multiple
+	  preconditions. Fixed precondition evaluation logic.
+
 2012-01-03  Ramon Novoa  <rnovoa@artica.es>
 
 	* pandora_windows_service.h,
diff --git a/pandora_agents/win32/modules/pandora_module.cc b/pandora_agents/win32/modules/pandora_module.cc
index 3ecab9e799..39e9dfd08d 100644
--- a/pandora_agents/win32/modules/pandora_module.cc
+++ b/pandora_agents/win32/modules/pandora_module.cc
@@ -1067,6 +1067,7 @@ Pandora_Module::evaluatePreconditions () {
 				ResumeThread (pi.hThread);
 	
 				/*string output;*/
+				output = "";
 				int tickbase = GetTickCount();
 				while ( (dwRet = WaitForSingleObject (pi.hProcess, 500)) != WAIT_ABANDONED ) {
 					PeekNamedPipe (out_read, buffer, BUFSIZE, &read, &avail, NULL);
@@ -1121,7 +1122,7 @@ Pandora_Module::evaluatePreconditions () {
 			CloseHandle (new_stdout);
 			CloseHandle (out_read);
 		
-			if (evaluateCondition (output, double_output, precond) != 0) {
+			if (evaluateCondition (output, double_output, precond) == 0) {
 				return 0;
 			}
 		}