diff --git a/config-mingw32 b/config-mingw32
index 1591cdfb..365344b2 100755
--- a/config-mingw32
+++ b/config-mingw32
@@ -1,5 +1,5 @@
 #!/bin/sh
-./configure --disable-test-compare-images --enable-external-libs --enable-werror --with-windows-wordsize=32 --with-buildrules=mingw
+./configure --disable-test-compare-images --enable-external-libs --enable-werror --with-windows-wordsize=32 --with-buildrules=mingw ${1+"$@"}
 # As of autoconf 2.69 and gcc 4.6, autoconf's configure fails to
 # recognize that defining _FILE_OFFSET_BITS works with mingw32.
 # Append to qpdf-config.h rather than passing CPPFLAGS on the
diff --git a/config-mingw64 b/config-mingw64
index 68f304ec..64384803 100644
--- a/config-mingw64
+++ b/config-mingw64
@@ -7,4 +7,5 @@
     RANLIB=x86_64-w64-mingw32-ranlib \
     DLLTOOL=x86_64-w64-mingw32-dlltool \
     STRIP=x86_64-w64-mingw32-strip \
-    OBJDUMP=x86_64-w64-mingw32-objdump
+    OBJDUMP=x86_64-w64-mingw32-objdump \
+    ${1+"$@"}
diff --git a/config-msvc b/config-msvc
index db0d9876..cb00cf63 100755
--- a/config-msvc
+++ b/config-msvc
@@ -4,8 +4,9 @@ if ! test "$wordsize" = "32" -o "$wordsize" = "64"; then
     echo "Usage: $0 {32,64}"
     exit 2
 fi
+shift
 objdump=
 if test "$wordsize" = "64"; then
     objdump=OBJDUMP=x86_64-w64-mingw32-objdump
 fi
-CC=cl CXX="cl -TP -GR" ./configure --disable-test-compare-images --enable-external-libs --enable-werror --with-windows-wordsize=$wordsize --with-buildrules=msvc $objdump
+CC=cl CXX="cl -TP -GR" ./configure --disable-test-compare-images --enable-external-libs --enable-werror --with-windows-wordsize=$wordsize --with-buildrules=msvc $objdump ${1+"$@"}