diff --git a/uppsrc/Core/Cpu.cpp b/uppsrc/Core/Cpu.cpp
index 48faf53f2..a4837c418 100644
--- a/uppsrc/Core/Cpu.cpp
+++ b/uppsrc/Core/Cpu.cpp
@@ -108,6 +108,7 @@ int CPU_Cores()
 #else
 		n = 1;
 #endif
+		n = max(n, 1); // sanity
 	}
 	return n;
 }