diff --git a/mailnews/extensions/Makefile.in b/mailnews/extensions/Makefile.in
index f6194ffe920e..f508a8e2e30e 100644
--- a/mailnews/extensions/Makefile.in
+++ b/mailnews/extensions/Makefile.in
@@ -26,6 +26,10 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
+ifdef MOZ_PSM
+BUILD_SMIME=1
+endif
+
 ifdef BUILD_SMIME
 DIRS		= smime
 endif
diff --git a/mailnews/mime/cthandlers/Makefile.in b/mailnews/mime/cthandlers/Makefile.in
index 1a5af20aa419..66869d48e07c 100644
--- a/mailnews/mime/cthandlers/Makefile.in
+++ b/mailnews/mime/cthandlers/Makefile.in
@@ -26,6 +26,10 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
+ifdef MOZ_PSM
+BUILD_SMIME=1
+endif
+
 DIRS = glue vcard
 
 ifndef BUILD_SMIME
diff --git a/mailnews/mime/src/Makefile.in b/mailnews/mime/src/Makefile.in
index 22db19e81b5b..03fc6d5b15ae 100644
--- a/mailnews/mime/src/Makefile.in
+++ b/mailnews/mime/src/Makefile.in
@@ -26,6 +26,10 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
+ifdef MOZ_PSM
+BUILD_SMIME=1
+endif
+
 ifdef BUILD_SMIME
 DEFINES		+= -DENABLE_SMIME
 endif