diff --git a/cibuild/linkexport.sh b/cibuild/linkexport.sh
index 1955549d..3f50e4f8 100644
--- a/cibuild/linkexport.sh
+++ b/cibuild/linkexport.sh
@@ -1,7 +1,7 @@
 echo "============= link export : begin ==============="
 emcc $EMCC_WEB -fPIC -sMAIN_MODULE=1 -O0 \
  -D__PYDK__=1 -DPREFIX=${PGROOT} \
- -sTOTAL_MEMORY=1GB -sSTACK_SIZE=4MB -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sGLOBAL_BASE=${CMA_MB}MB \
+ -sTOTAL_MEMORY=256MB -sSTACK_SIZE=4MB -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sGLOBAL_BASE=${CMA_MB}MB \
  -sERROR_ON_UNDEFINED_SYMBOLS -sASSERTIONS=0 \
  -lnodefs.js -lidbfs.js \
  -sEXPORTED_RUNTIME_METHODS=FS,setValue,getValue,UTF8ToString,stringToNewUTF8,stringToUTF8OnStack,ccall,cwrap,callMain \
diff --git a/cibuild/linkweb.sh b/cibuild/linkweb.sh
index b0807000..866d7c1e 100755
--- a/cibuild/linkweb.sh
+++ b/cibuild/linkweb.sh
@@ -185,7 +185,7 @@ _________________________________________________________
 
 
     emcc $EMCC_WEB $LINKER $MODULE  \
-     -sTOTAL_MEMORY=1GB -sSTACK_SIZE=4MB -sGLOBAL_BASE=${CMA_MB}MB \
+     -sTOTAL_MEMORY=256MB -sSTACK_SIZE=4MB -sGLOBAL_BASE=${CMA_MB}MB \
      -fPIC -D__PYDK__=1 -DPREFIX=${PGROOT} \
      -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sERROR_ON_UNDEFINED_SYMBOLS -sASSERTIONS=0 \
      -lnodefs.js -lidbfs.js \
diff --git a/cibuild/pgbuild.sh b/cibuild/pgbuild.sh
index 938dfb24..85f67fa4 100644
--- a/cibuild/pgbuild.sh
+++ b/cibuild/pgbuild.sh
@@ -117,7 +117,7 @@ END
 
     # only required for static initdb
     EMCC_CFLAGS="-sERROR_ON_UNDEFINED_SYMBOLS=0 ${CC_PGLITE}"
-    EMCC_CFLAGS="${EMCC_CFLAGS} -sTOTAL_MEMORY=1GB -sSTACK_SIZE=5MB -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sGLOBAL_BASE=${CMA_MB}MB"
+    EMCC_CFLAGS="${EMCC_CFLAGS} -sTOTAL_MEMORY=256MB -sSTACK_SIZE=5MB -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sGLOBAL_BASE=${CMA_MB}MB"
     EMCC_CFLAGS="${EMCC_CFLAGS} -DPREFIX=${PGROOT}"
 
     export EMCC_CFLAGS="${EMCC_CFLAGS} -Wno-macro-redefined -Wno-unused-function"