diff --git a/sci-physics/root/root-6.12.06-r11.ebuild b/sci-physics/root/root-6.12.06-r11.ebuild
index 139fd7277d1e0..2cf1a95ecc941 100644
--- a/sci-physics/root/root-6.12.06-r11.ebuild
+++ b/sci-physics/root/root-6.12.06-r11.ebuild
@@ -6,7 +6,7 @@ EAPI=6
 # ninja does not work due to fortran
 CMAKE_MAKEFILE_GENERATOR=emake
 FORTRAN_NEEDED="fortran"
-PYTHON_COMPAT=( python3_6 )
+PYTHON_COMPAT=( python2_7 python3_6 )
 
 inherit cmake-utils eapi7-ver elisp-common eutils fortran-2 \
 	prefix python-single-r1 toolchain-funcs
diff --git a/sci-physics/root/root-6.14.08-r4.ebuild b/sci-physics/root/root-6.14.08-r4.ebuild
index eeb19eb0b2084..5bbe2ef197697 100644
--- a/sci-physics/root/root-6.14.08-r4.ebuild
+++ b/sci-physics/root/root-6.14.08-r4.ebuild
@@ -6,7 +6,7 @@ EAPI=6
 # ninja does not work due to fortran
 CMAKE_MAKEFILE_GENERATOR=emake
 FORTRAN_NEEDED="fortran"
-PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_COMPAT=( python2_7 python3_{6,7} )
 
 inherit cmake-utils cuda eapi7-ver elisp-common eutils fortran-2 \
 	prefix python-single-r1 toolchain-funcs
diff --git a/sci-physics/root/root-6.16.00-r4.ebuild b/sci-physics/root/root-6.16.00-r4.ebuild
index c4a7323b08a32..a5cb23b4a646d 100644
--- a/sci-physics/root/root-6.16.00-r4.ebuild
+++ b/sci-physics/root/root-6.16.00-r4.ebuild
@@ -6,7 +6,7 @@ EAPI=6
 # ninja does not work due to fortran
 CMAKE_MAKEFILE_GENERATOR=emake
 FORTRAN_NEEDED="fortran"
-PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_COMPAT=( python2_7 python3_{6,7} )
 
 inherit cmake-utils cuda eapi7-ver elisp-common eutils fortran-2 \
 	prefix python-single-r1 toolchain-funcs
diff --git a/sci-physics/root/root-6.18.04.ebuild b/sci-physics/root/root-6.18.04.ebuild
index 369dc19e6dbe8..ff963889945d3 100644
--- a/sci-physics/root/root-6.18.04.ebuild
+++ b/sci-physics/root/root-6.18.04.ebuild
@@ -6,7 +6,7 @@ EAPI=6
 # ninja does not work due to fortran
 CMAKE_MAKEFILE_GENERATOR=emake
 FORTRAN_NEEDED="fortran"
-PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_COMPAT=( python2_7 python3_{6,7} )
 
 inherit cmake-utils cuda eapi7-ver elisp-common eutils fortran-2 \
 	prefix python-single-r1 toolchain-funcs
diff --git a/sci-physics/root/root-9999.ebuild b/sci-physics/root/root-9999.ebuild
index 5af6fb5eac025..2ced39aaf1984 100644
--- a/sci-physics/root/root-9999.ebuild
+++ b/sci-physics/root/root-9999.ebuild
@@ -6,7 +6,7 @@ EAPI=6
 # ninja does not work due to fortran
 CMAKE_MAKEFILE_GENERATOR=emake
 FORTRAN_NEEDED="fortran"
-PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_COMPAT=( python2_7 python3_{6,7} )
 
 inherit cmake-utils cuda eapi7-ver elisp-common eutils fortran-2 \
 	prefix python-single-r1 toolchain-funcs