diff --git a/curl/curl.Dockerfile b/curl/curl.Dockerfile
index 8e3e51d..9e7588d 100644
--- a/curl/curl.Dockerfile
+++ b/curl/curl.Dockerfile
@@ -25,4 +25,4 @@ RUN ./configure \
 	--host=$HOST \
   --prefix=/curl-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/expat/expat.Dockerfile b/expat/expat.Dockerfile
index 307f0a8..5012190 100644
--- a/expat/expat.Dockerfile
+++ b/expat/expat.Dockerfile
@@ -30,4 +30,4 @@ RUN ./configure \
 	--host=$HOST \
   --prefix=/expat-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/gdal/gdal.Dockerfile b/gdal/gdal.Dockerfile
index 1b9e228..873a6aa 100644
--- a/gdal/gdal.Dockerfile
+++ b/gdal/gdal.Dockerfile
@@ -41,4 +41,4 @@ RUN ./configure \
   --host=$HOST \
   --prefix=/gdal-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/geos/geos.Dockerfile b/geos/geos.Dockerfile
index 79ee6e1..bf84306 100644
--- a/geos/geos.Dockerfile
+++ b/geos/geos.Dockerfile
@@ -29,5 +29,5 @@ RUN ./configure \
   --host=$HOST \
   --prefix=/geos-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
 
diff --git a/iconv/iconv.Dockerfile b/iconv/iconv.Dockerfile
index 3d7ccfd..4421aef 100644
--- a/iconv/iconv.Dockerfile
+++ b/iconv/iconv.Dockerfile
@@ -27,4 +27,4 @@ RUN ./configure \
   --host=$HOST \
   --prefix=/iconv-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/leptonica/leptonica.Dockerfile b/leptonica/leptonica.Dockerfile
index 0edb02b..d913508 100644
--- a/leptonica/leptonica.Dockerfile
+++ b/leptonica/leptonica.Dockerfile
@@ -46,4 +46,4 @@ RUN ./configure \
   --without-libopenjpeg \
   --prefix=/leptonica-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/opencv/opencv.Dockerfile b/opencv/opencv.Dockerfile
index 1ea87d6..c0e0f7d 100644
--- a/opencv/opencv.Dockerfile
+++ b/opencv/opencv.Dockerfile
@@ -57,4 +57,4 @@ RUN cmake \
   -D CMAKE_INSTALL_PREFIX:PATH=/opencv-build \
   ..
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/proj/proj.Dockerfile b/proj/proj.Dockerfile
index 24f9de1..ccf88ed 100644
--- a/proj/proj.Dockerfile
+++ b/proj/proj.Dockerfile
@@ -27,4 +27,4 @@ RUN ./configure \
   --host=$HOST \
   --prefix=/proj-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/spatialite/spatialite.Dockerfile b/spatialite/spatialite.Dockerfile
index b224b3b..7be5863 100644
--- a/spatialite/spatialite.Dockerfile
+++ b/spatialite/spatialite.Dockerfile
@@ -90,4 +90,4 @@ RUN CFLAGS=$(tr "\r\n" " " < cflags.tmp) \
   --disable-examples \
   --prefix=/spatialite-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/sqlite3/sqlite3.Dockerfile b/sqlite3/sqlite3.Dockerfile
index 6c3defe..ada740a 100644
--- a/sqlite3/sqlite3.Dockerfile
+++ b/sqlite3/sqlite3.Dockerfile
@@ -46,4 +46,4 @@ RUN ./configure \
   --disable-tcl \
   --prefix=/sqlite3-build/
 
-RUN make -j4  && make install
+RUN make -j  && make install
diff --git a/tesseract/tesseract-3.05.02.Dockerfile b/tesseract/tesseract-3.05.02.Dockerfile
index 7fa87d3..d9b4e10 100644
--- a/tesseract/tesseract-3.05.02.Dockerfile
+++ b/tesseract/tesseract-3.05.02.Dockerfile
@@ -48,4 +48,4 @@ RUN ./configure \
   --disable-largefile \
   --prefix=/tesseract-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
diff --git a/tesseract/tesseract-4.0.0.Dockerfile b/tesseract/tesseract-4.0.0.Dockerfile
index 66d7825..c7e78db 100644
--- a/tesseract/tesseract-4.0.0.Dockerfile
+++ b/tesseract/tesseract-4.0.0.Dockerfile
@@ -52,5 +52,5 @@ RUN cmake \
   -D CMAKE_CXX_FLAGS="-Qunused-arguments -Wl,-rpath-link,/tiff-build/lib" \
   ..
 
-RUN make -j4
+RUN make -j
 RUN make install
diff --git a/tiff/tiff.Dockerfile b/tiff/tiff.Dockerfile
index c721c58..c3207ba 100644
--- a/tiff/tiff.Dockerfile
+++ b/tiff/tiff.Dockerfile
@@ -39,7 +39,7 @@ RUN ./configure \
       --host=$HOST \
       --prefix=/tiff-build/
 
-RUN make -j4 && make install
+RUN make -j && make install
 
 # Fix b0rked .pc naming
 RUN mv /tiff-build/lib/pkgconfig/libtiff-4.pc /tiff-build/lib/pkgconfig/tiff.pc
diff --git a/udunits-2/udunits-2.Dockerfile b/udunits-2/udunits-2.Dockerfile
index ddc53de..3d50401 100644
--- a/udunits-2/udunits-2.Dockerfile
+++ b/udunits-2/udunits-2.Dockerfile
@@ -41,4 +41,4 @@ RUN CFLAGS=$(pkg-config expat --cflags) \
   --host=$HOST \
   --prefix=/udunits-2-build/
 
-RUN make -j4 && make install
+RUN make -j && make install