diff --git a/historic/jam/src/build.jam b/historic/jam/src/build.jam
index 58f8200db..94d7e63a2 100644
--- a/historic/jam/src/build.jam
+++ b/historic/jam/src/build.jam
@@ -85,7 +85,7 @@ toolset cc $(CC) : "-o " : -D
     : $(LIBS) ;
 ## Comeau C/C++ 4.x
 toolset como como : "-o " : -D
-    :
+    : --c
     [ opt --release : --inlining ]
     [ opt --debug : --no_inlining ] ;
 ## MacOSX Darwin, using GCC 2.9.x, 3.x
diff --git a/historic/jam/src/build.sh b/historic/jam/src/build.sh
index abcbea948..a9ffc3231 100644
--- a/historic/jam/src/build.sh
+++ b/historic/jam/src/build.sh
@@ -134,7 +134,7 @@ case $BOOST_JAM_TOOLSET in
     ;;
     
     como)
-    BOOST_JAM_CC=como
+    BOOST_JAM_CC="como --c"
     ;;
     
     kcc)
diff --git a/jam_src/build.jam b/jam_src/build.jam
index 58f8200db..94d7e63a2 100644
--- a/jam_src/build.jam
+++ b/jam_src/build.jam
@@ -85,7 +85,7 @@ toolset cc $(CC) : "-o " : -D
     : $(LIBS) ;
 ## Comeau C/C++ 4.x
 toolset como como : "-o " : -D
-    :
+    : --c
     [ opt --release : --inlining ]
     [ opt --debug : --no_inlining ] ;
 ## MacOSX Darwin, using GCC 2.9.x, 3.x
diff --git a/jam_src/build.sh b/jam_src/build.sh
index abcbea948..a9ffc3231 100644
--- a/jam_src/build.sh
+++ b/jam_src/build.sh
@@ -134,7 +134,7 @@ case $BOOST_JAM_TOOLSET in
     ;;
     
     como)
-    BOOST_JAM_CC=como
+    BOOST_JAM_CC="como --c"
     ;;
     
     kcc)