diff --git a/env/DAMASK.sh b/env/DAMASK.sh
index c74c447ed..e26389257 100644
--- a/env/DAMASK.sh
+++ b/env/DAMASK.sh
@@ -60,7 +60,7 @@ if [ ! -z "$PS1" ]; then
   echo -n "heap  size         "
    [[ "$(ulimit -d)" == "unlimited" ]] \
    && echo "unlimited" \
-   || echo $(python -c \
+   || echo $(python3 -c \
           "import math; \
            size=$(( 1024*$(ulimit -d) )); \
            print('{:.4g} {}'.format(size / (1 << ((int(math.log(size,2) / 10) if size else 0) * 10)), \
@@ -68,7 +68,7 @@ if [ ! -z "$PS1" ]; then
   echo -n "stack size         "
    [[ "$(ulimit -s)" == "unlimited" ]] \
    && echo "unlimited" \
-   || echo $(python -c \
+   || echo $(python3 -c \
           "import math; \
            size=$(( 1024*$(ulimit -s) )); \
            print('{:.4g} {}'.format(size / (1 << ((int(math.log(size,2) / 10) if size else 0) * 10)), \
diff --git a/env/DAMASK.zsh b/env/DAMASK.zsh
index 5813d110a..57efa7667 100644
--- a/env/DAMASK.zsh
+++ b/env/DAMASK.zsh
@@ -50,7 +50,7 @@ if [ ! -z "$PS1" ]; then
   echo -n "heap  size         "
    [[ "$(ulimit -d)" == "unlimited" ]] \
    && echo "unlimited" \
-   || echo $(python -c \
+   || echo $(python3 -c \
           "import math; \
            size=$(( 1024*$(ulimit -d) )); \
            print('{:.4g} {}'.format(size / (1 << ((int(math.log(size,2) / 10) if size else 0) * 10)), \
@@ -58,7 +58,7 @@ if [ ! -z "$PS1" ]; then
   echo -n "stack size         "
    [[ "$(ulimit -s)" == "unlimited" ]] \
    && echo "unlimited" \
-   || echo $(python -c \
+   || echo $(python3 -c \
           "import math; \
            size=$(( 1024*$(ulimit -s) )); \
            print('{:.4g} {}'.format(size / (1 << ((int(math.log(size,2) / 10) if size else 0) * 10)), \