diff --git a/Modules/pci/kpci_private.h b/Modules/pci/kpci_private.h
--- a/Modules/pci/kpci_private.h
+++ b/Modules/pci/kpci_private.h
@@ -45,6 +45,15 @@
 	QString name;
 };
 
+/* Following structures MUST BE packed, otherwise variables will be mapped to
+   wrong places. Q_PACKED macro seems to not work very well. `#pragma pack` are
+   more widely adopted, and should be ignored if not supported.
+
+   TODO: It will be good to check if structures was packed by compiler, and
+         disable this module entirely if not.
+*/
+#pragma pack(push, 1)
+
 union pciInfo {
 	unsigned char raw[256];
 	struct {
@@ -432,6 +441,8 @@
 	} cooked Q_PACKED;
 } Q_PACKED;
 
+#pragma pack(pop)
+
 //In following arrays -1 mean default value
 
 //keep -1 in last position