diff --git a/.github/workflows/root-ci-config/buildconfig/mac13.txt b/.github/workflows/root-ci-config/buildconfig/mac13.txt
index f1206b5371ce9..ca7b20ae43bee 100644
--- a/.github/workflows/root-ci-config/buildconfig/mac13.txt
+++ b/.github/workflows/root-ci-config/buildconfig/mac13.txt
@@ -1,3 +1,4 @@
+CMAKE_BUILD_RPATH=/usr/local/lib
 asimage_tiff=OFF
 builtin_cfitsio=ON
 builtin_cppzmq=ON
@@ -27,7 +28,6 @@ builtin_zeromq=ON
 builtin_zstd=ON
 ccache=ON
 cocoa=ON
-fortran=OFF
 minuit2_omp=OFF
 pythia8=OFF
 test_distrdf_dask=ON
diff --git a/main/src/h2root.cxx b/main/src/h2root.cxx
index b839c9d8319b4..c119b2e40100c 100644
--- a/main/src/h2root.cxx
+++ b/main/src/h2root.cxx
@@ -312,11 +312,7 @@ int main(int argc, char **argv)
 
    int lun = 10;
 #ifndef WIN32
-   // "px" is a string being changed to "pxc" in the fortran side; since it's a temporary on C's side,
-   // we need a buffer of at least 3 chars on Cs side, too. Predefine it as a extra variable "px " since that way
-   // the space will be replaced by 'c' on the preallocated memory, instead of appending a new char (new memory) to "px".
-   auto opt = PASSCHAR("px ");
-   hropen(lun,PASSCHAR("example"),PASSCHAR(file_in),opt,record_size,ier,7,strlen(file_in),2);
+   hropen(lun,PASSCHAR("example"),PASSCHAR(file_in),PASSCHAR("px"),record_size,ier,7,strlen(file_in),2);
 #else
    hropen(lun,PASSCHAR("example"),PASSCHAR(file_in),PASSCHAR("px"),record_size,ier);
 #endif
diff --git a/misc/minicern/src/hbook.f b/misc/minicern/src/hbook.f
index 522c731686169..6c107c3ff1c4b 100644
--- a/misc/minicern/src/hbook.f
+++ b/misc/minicern/src/hbook.f
@@ -249,6 +249,9 @@ SUBROUTINE HROPEN(LUN,CHDIR,CFNAME,CHOPTT,LRECL,ISTAT)
       CHARACTER*(*) CFNAME,CHDIR,CHOPTT
       CHARACTER*8 CHOPT
       CHOPT=CHOPTT
+      DO 11 I=LEN(CHOPTT)+1,8
+         CHOPT(I:I) = ' '
+  11  CONTINUE
       CALL CLTOU(CHOPT)
       DO 10 I=1,NCHTOP
          IF(CFNAME.EQ.HFNAME(I))THEN