diff --git a/Include/Sections.nsh b/Include/Sections.nsh
index 858973a8..af101daa 100644
--- a/Include/Sections.nsh
+++ b/Include/Sections.nsh
@@ -42,4 +42,36 @@
 	Pop $0
 !macroend
 
+; For details about SetSectionInInstType and ClearSectionInInstType, see
+; http://nsis.sourceforge.net/archive/nsisweb.php?page=287
+
+!define INSTTYPE_1 1
+!define INSTTYPE_2 2
+!define INSTTYPE_3 4
+!define INSTTYPE_4 8
+!define INSTTYPE_5 16
+!define INSTTYPE_6 32
+!define INSTTYPE_7 64
+!define INSTTYPE_8 128
+
+!macro SetSectionInInstType SECTION_NAME WANTED_INSTTYPE
+	Push $0
+	SectionGetInstTypes "${SECTION_NAME}" $0
+	IntOp $0 $0 | ${WANTED_INSTTYPE}
+	SectionSetInstTypes "${SECTION_NAME}" $0
+	Pop $0
+!macroend
+
+!macro ClearSectionInInstType SECTION_NAME WANTED_INSTTYPE
+	Push $0
+	Push $1
+	SectionGetInstTypes "${SECTION_NAME}" $0
+	StrCpy $1 ${WANTED_INSTTYPE}
+	IntOp $1 $1 ~
+	IntOp $0 $0 & $1
+	SectionSetInstTypes "${SECTION_NAME}" $0
+	Pop $1
+	Pop $0
+!macroend
+
 !endif
\ No newline at end of file