diff --git a/themes/base.theme.bash b/themes/base.theme.bash
index 652e65ee..ca245244 100644
--- a/themes/base.theme.bash
+++ b/themes/base.theme.bash
@@ -436,17 +436,17 @@ function clock_prompt {
 # backwards-compatibility
 function git_prompt_info {
   git_prompt_vars
-  echo -e "$SCM_PREFIX$SCM_BRANCH$SCM_STATE$SCM_SUFFIX"
+  echo -e "${SCM_PREFIX}${SCM_BRANCH}${SCM_STATE}${SCM_SUFFIX}"
 }
 
 function svn_prompt_info {
   svn_prompt_vars
-  echo -e "$SCM_PREFIX$SCM_BRANCH$SCM_STATE$SCM_SUFFIX"
+  echo -e "${SCM_PREFIX}${SCM_BRANCH}${SCM_STATE}${SCM_SUFFIX}"
 }
 
 function hg_prompt_info() {
   hg_prompt_vars
-  echo -e "$SCM_PREFIX$SCM_BRANCH:${SCM_CHANGE#*:}$SCM_STATE$SCM_SUFFIX"
+  echo -e "${SCM_PREFIX}${SCM_BRANCH}:${SCM_CHANGE#*:}${SCM_STATE}${SCM_SUFFIX}"
 }
 
 function scm_char {